Hi haller.m,

The Sony WH-1000XM5 headphones offer improved noise-cancelling technology compared to previous models such as the WH-1000XM3.
such as the WH-1000XM3. The WH-1000XM5 feature a new processor that detects ambient noise in real time
and adjusts the noise cancelling accordingly. This enables more effective suppression of ambient noise
ambient noise and an overall better sound quality.
Overall, it can be said that the noise cancelling function of the WH-1000XM5 is a noticeable improvement compared to the WH-1000XM3.

Sony Europe

For me, much better than the WH-1000XM3. The WH-1000XM5 have been in use for 1 year. The intensity of the noise cancellation can also be adjusted. At max suppression, not even the noise of the hoover comes through.

Perhaps a little better, but the workmanship and quality of the headphones themselves is extremely much worse than the M3. Would swap my M5 with you immediately if the headphones hadn't ended up in the bin after 3 months of use. Sony warranty was also worth nothing.