These are headphones, yet sound quality is covered like it's secondary. What reviewers should really cover are:
In terms of sound quality, the AirPods Max sound fantastic, but again, choosing one set of headphones over the other really comes down to preference. We thought the AirPods Max had the most balanced sound experience of the bunch. The Sennheiser headphones really did poorly compared to the others, but the Bose and Sony headphones both sounded great, though leaned toward being bass heavy. That said, all of the headphones except the AirPods Max have adjustable EQ settings so they can be tweaked to your liking.
This will come as no surprise, but when it comes to Active Noise Cancellation, the Sony XM4's and the AirPods Max win out. Sony has always been the best at noise cancellation, and the AirPods Max are truly competitive. All of these options have solid ANC capabilities, though, and it's a close call.
1. Is there wired (i.e. analog input) playback?
2. Can you change noise cancellation level?
3. Did you compare them with ANC off as well?
These are the things that matter. ANC always comes with a compromise in sound quality (both with frequency response and dynamic range). If you want to tell whether the sound quality difference is due to ANC or because some of these are just better headphones, you need to do the testing with ANC off as well.