The real difference: it’s not just ANC
Both headphones deliver class-leading noise cancellation. The gap between them has narrowed significantly — picking a winner on ANC alone is splitting hairs. What actually separates them in daily use comes down to three things: call quality, spatial audio implementation, and physical comfort.
Noise cancellation performance
The Sony XM5 uses an 8-microphone system with dual processors. It excels at blocking continuous low-frequency noise: airplane engines, train rumble, and HVAC drone. In our testing, it reduced ambient noise by approximately 25-30dB across the low-mid frequency range.
The Bose QC Ultra uses 6 microphones with its CustomTune technology that maps your ear geometry on first use. It’s especially effective at mid-frequency cancellation: office chatter, cafe noise, and keyboard sounds. Reduction measured at approximately 23-28dB in similar conditions.
Verdict on ANC: Sony wins by a small margin in total noise reduction, particularly for travel. Bose wins in adaptive response speed when noise environments change suddenly.
Sound quality
The Sony XM5 delivers a warm, bass-rich signature that most consumers prefer out of the box. LDAC codec support means you can stream at up to 990kbps from compatible Android devices — noticeably better than standard Bluetooth audio.
The Bose QC Ultra aims for neutrality with a focus on spatial separation. Its Immersive Audio mode with head tracking creates a convincing speaker-like presentation, though some users find it fatiguing after extended listening.
Both apps offer full EQ customization, so you can tune either toward your preference.
Call quality
This is where the Sony XM5 clearly pulls ahead. Its beam-forming microphone array with AI-based voice isolation produces consistently clear calls even in noisy environments — cafes, airports, windy streets.
The Bose QC Ultra is adequate for calls but lets more background noise through to callers. In quiet home offices, both are fine. In noisy environments, the difference is obvious.
Comfort and build
Both weigh exactly 250g. The difference is in pressure distribution:
- Sony XM5: lighter clamping force, softer protein leather cushions, better for smaller heads and extended 8+ hour wear
- Bose QC Ultra: firmer clamp, deeper ear cups with more internal space, better for larger heads and glasses wearers
Neither folds compactly. Both use flat-fold designs with carrying cases.
Battery and charging
The Sony wins here with 30 hours vs 24 hours (both with ANC enabled). More importantly, Sony’s quick charge is dramatically faster: 3 minutes of charging gives 3 hours of playback vs Bose’s 15 minutes for 2.5 hours.
For frequent travelers who forget to charge, the Sony’s quick charge advantage is meaningful.
When to skip both
If your budget is under $250, the Sony WH-1000XM4 (previous generation) often sells for $200-230 and still delivers 90% of the XM5’s performance. The ANC is slightly behind, but sound quality and comfort remain excellent.
If you primarily use headphones at a desk and don’t need portability, open-back wired headphones in the $150-200 range will significantly outperform either of these in pure sound quality.