By aspect — in detail
Isolation
Strong consensus · 9 srcThe headline strength and the clearest agreement: the active noise cancellation is rated best- or near-best-in-class, especially against low-frequency drone (planes, trains, HVAC), with a well-liked Ambient/transparency mode. Two caveats recur — a faint background hiss (the ANC's own noise floor) and, for some, a stuffy eardrum-pressure feeling on the strongest setting. But on raw quieting, sources line up.
“Among the best in its class, the Sony WH-1000XM4 offers very good noise cancelation and isolation.”
SoundGuys (Adam Molina)
“Once I turned on NC, it zeroed that noise out like it never was there.”
Audio Science Review (amirm)
Measured
TechGearLab measures the XM4 reducing outside noise by an average of 27 dB (vs 31 dB for the XM5). ASR found the headphone passively removes ~80% of noise, then NC eliminated the rest. What Hi-Fi rates it just behind Bose's QuietComfort 45, Noise Cancelling 700 and QuietComfort Ultra but 'good enough for most environments.' headphones.com notes the ANC adds a mild background hiss, and TechGearLab and SoundGuys both flag a stuffy in-ear pressure some listeners feel.
Comfort
Strong consensus · 8 srcThe second pillar of agreement: light (~250–254 g), plush and easy to wear for hours, with softer, larger pads than the XM3 and a fold-up-small case. Two soft caveats keep it from being flawless — the pleather pads trap heat over a long session, and the relatively gentle clamp makes for a looser fit (with no IP rating, Sony doesn't pitch them for exercise). A small minority also report crown or ANC pressure. Comfort is essentially uncontested.
“one of the most comfortable over-ear headphones that I have ever tested.”
RecordingNow (ODi Productions)
“The headphones are extremely comfortable.”
HeadphoneReview.com
Measured
Measured light: RecordingNow weighed 251.6 g, SoundGuys 251 g, What Hi-Fi lists 254 g — among the lightest full-size ANC over-ears. Pads are softer and ~10% larger than the XM3's; there is no water or dust resistance. SoundGuys notes an 'ever-present pressure at the crown of my head' on longer sessions, and warm ears after 1–2 hours is the common comfort ceiling.
Tonality
Contested · 8 srcThe heart of the disagreement. Out of the box it's a warm, bass-forward consumer voicing, and sources split on whether that reads as dynamic and musical or as a colored, V-shaped tuning that needs correcting. The split tracks who's listening (mainstream vs enthusiast/measurement) and whether they EQ — and nearly everyone agrees it takes EQ beautifully.
Measured
ASR's passive (unpowered) measurement is badly colored — a 100–200 Hz hump and a 2–3 kHz dip, a 'whopping 24 dB deviation from our target' that ASR calls 'the worse we have seen so far in any headphone' — but powering the unit on pulls the response much closer to the preference target. So the shipped voicing is warm/bass-lifted with a 5–6 kHz peak, and EQ largely fixes it.
⚠ vs. listeners — The graph confirms a genuinely colored, bass-lifted V-ish response — the objective part isn't in dispute. What splits reviewers is whether that same tilt lands as 'fun and dynamic' or 'boomy and V-shaped,' which comes down to listener type and how much you reach for the EQ.
Where it splits
A dynamic, musical, well-judged consumer sound — a genuine step up over the XM3, enjoyable straight out of the box.42%
“Dynamic, detail-rich sound”
What Hi-Fi?
A colored, V-shaped tuning that's boomy and aggressive as shipped and really wants EQ to sound balanced.58%
“In general the XM4 has a significant ‘V-shaped’ tonality”
headphones.com
Genuinely split, and it tracks your reference point and EQ habits. The low end is elevated with a bloom in the upper-bass/lower-mid region; one camp hears that as thick, boomy and detail-masking, the other as deep, punchy and fun. A few dB of bass cut is the repeated fix, and reviewers who EQ tend to land in the second camp.
Measured
headphones.com measures 'the bass shelf extends up past 250hz with a massive boost in the bass-to-mid transition'; SoundGuys, by contrast, calls the XM4's lows more neutral-leaning than the bassier rivals it's cross-shopped against. The near-universal recommendation is a few dB of bass cut via Sony's app EQ or a custom profile, after which the low end reads as full but controlled.
Where it splits
Boomy and bloated — an upper-bass hump that muddies the mix and masks detail until you EQ it down.52%
“This makes everything sound thick and muddy, boomy and overbearing.”
headphones.com
Deep, punchy and poised — powerful low end that makes music feel bigger and more fun.48%
“There’s power, punch and a sense of poise that makes the WH-1000XM3 sound, dare we say it, a little tubby.”
What Hi-Fi?
Generally regarded as full and warm — vocals and acoustic instruments come across with body — but the recurring caveat is indirect: the upper-bass bloom can leave the lower mids cloudy and vocals a touch distant until the bass is tamed. Decent, occasionally muddied, rarely the headline.
“The mids are well-tuned too.”
HeadphoneReview.com
“the mids can sometimes get a little cloudy when a strong bass line kicks in”
TechGearLab (Rachael Lamore)
Sources split, and oddly in two directions at once. One camp hears a newly smooth, refined top end — a highlight over the XM3; the other hears it as a weak spot, either veiled and short on air or carrying a pushed 5–6 kHz that turns occasionally strident. The measurement reconciles them: a presence peak with limited air above it can read as both 'aggressive' and 'lacking sparkle.'
Measured
headphones.com and SoundGuys both flag a 5–6 kHz presence peak with limited air above ~10 kHz — the same top end that reads as 'detailed/aggressive' to some listeners and 'veiled/rolled-off' to others. RecordingNow's fix is EQ that tames the peak and lifts the air.
Where it splits
Smooth, refined and non-fatiguing — a clear step up in polish over the previous model.38%
“There’s a newfound smoothness in the treble that makes the old model sound a tiny bit unrefined in comparison.”
What Hi-Fi?
The weak spot — uneven up top, veiled and short on air to some, occasionally piercing to others.62%
“The highs are a bit hit or miss. Usually, there's plenty of detail and presence, but occasionally, they become either piercing or distant.”
TechGearLab (Rachael Lamore)
Splits on expectations. Mainstream reviewers are impressed by the clarity for a wireless ANC can; enthusiasts and measurement-minded reviewers call it consumer-grade — the bass bloom obscures micro-detail, and similarly priced wired closed-backs pull ahead. Not bad; not audiophile.
Measured
The elevated bass-to-mid region and DSP tuning are the usual explanation for the 'masks detail' reads; enthusiast reviewers cross-shop it against similarly priced wired closed-backs (e.g. the Audeze Maxwell) and find it outclassed on pure resolution.
Where it splits
Clear and detail-rich for a wireless noise-canceller — more than enough resolution for most listeners.60%
“We were generally impressed with the clarity and detail.”
TechGearLab (Rachael Lamore)
Consumer-grade — it masks detail and is beaten by less expensive closed-backs, not an audiophile performer.40%
“it doesn’t even compete all that well when compared with less expensive closed-back headphones”
headphones.com
Soundstage
Moderate · 5 srcDecent-to-good for a sealed closed-back — several reviewers found it wider and more dimensional than expected (and than the XM3), better than anything near its discounted price — but it's still bounded, and one reviewer hears it as narrow and '2D.' A mild positive with a low ceiling.
“The soundfield appears wider, with the headphones able to use the extra headroom to uncover even more detail.”
What Hi-Fi?
“more dimensional than anything you'll find below $100”
TechGearLab (Rachael Lamore)
“Intimate soundstage lacks width and depth”
RecordingNow (ODi Productions)
Lightly covered and mixed. Instruments are reasonably separated for a consumer closed-back, but placement isn't pinpoint — one measurement-minded review notes the image distinction isn't as well-defined as sharper headphones. Fine, not a strength.
“Instruments are clearly separated”
HeadphoneReview.com
“giving each instrument its own space”
TechGearLab (Rachael Lamore)
A relative strength: reviewers praise the timing and the sense of punch and drive, part of why the sound is often called 'fun' and 'entertaining.' The one caveat is that the leading-edge attack can feel a touch soft — strong macrodynamics, slightly sluggish micro-transients.
“Sensational sense of timing”
What Hi-Fi?
“For macrodynamics, the XM4 is surprisingly decent.”
headphones.com
Argued over. One camp sees a light, solid, built-to-last design with a genuinely nice fold-up case; the other finds the mostly-plastic construction cheap-feeling for the price, with pleather pads that wear over time. The plastic and the missing IP rating are real; how premium it feels is where opinions part.
Measured
Predominantly plastic with folding hinges and softer pleather pads; no IP rating (no water, dust or sweat resistance). SoundGuys scores durability middling (6.9/10). The pleather earpads are a known long-term wear item on the XM3/XM4 generation.
Where it splits
Light but solid — feels built to last, with textured plastics and an excellent fold-flat case.68%
“they certainly give the impression that they’re built to last.”
What Hi-Fi?
Cheap-feeling for the money — plasticky in the hand, with pleather pads that degrade over the years.32%
“As somebody who owned one of these, I personally hated the build for it's cheap plasticky feel.”
Reddit r/headphones (owner)
The verdict forks on price. At the 2020 list of $350 the pure-sound value was questioned; heavily discounted since (often ~$200–250), most reviewers now call it a bargain for the ANC-plus-comfort package. The dissent is that on sound alone, cheaper headphones compete or win.
Measured
Launched at $350 / £350 / AU$550; routinely discounted to roughly $200–250 since the XM5 arrived. Owner ratings are high (4.6/5 from 62,628 Amazon ratings) but self-selected, so they read broad satisfaction rather than settling the sound debate.
Where it splits
Excellent value, especially on discount — the ANC, comfort and features make it a steal at today's prices.72%
“an absolute steal for what they offer.”
TechGearLab (Rachael Lamore)
Expensive relative to the competition — you can get better pure sound for less.28%
“Expensive relative to competition”
headphones.com
