So, after a month of testing the Px8, I’ve decided to send them back. They’re very good headphones and they sound great while being premium and comfortable. I think they are much better than the "original" PX7 which I didn't like. However, I always thought that they’re “good” but not “699€ good”. Doesn’t make much sense to think that way maybe but listening to them side by side with my Momentum 4, I felt the Px8 sounded better but not by a huge margin. Especially not for modern music and genres. Or to put it differently, the M4 sound very good with regard to what I paid for them (234€, pretty much a third of the Px8). More than good enough for what I need in a Bluetooth ANC headphone probably. They’re also very comfortable but they’re not as stylish and not as well built obviously. ANC is very comparable, though. Call quality sounded better than on the Px8 people told me. I slightly prefer the M4's sound to the AirPods Max I had before the Px8 and which I used for 21 months.
At first, I did not have any issues with the wear sensor on the Px8 but after a while it was acting up. I did a factory reset but it still was overly sensitive no matter what I did. The wear sensor on the M4 works as it should. No issues at all. I usually prefer physical buttons on headphones, and I liked the buttons on the Px8 but I have to admit that the touch commands work very well on the M4 and even faster than using the buttons. I also think the Sennheiser app offers a better overall experience than the B&W app and has more features (+ they
do provide firmware updates). Both cases are great, so no advantage there either for the Px8. Battery life on the M4 is twice as good as on the Px8. It kind of goes on like this.
It still wasn’t an easy decision as the B&W are so sexy, stylish, premium and great sounding. All very important things of course and I’m sure I will miss them. I would probably gladly pay 449€ to 499€ for them and feel happy about it. For now, only my wallet is really happy about the situation