Noticed no difference so far. I've tested the XM2 extensively along with the XM3 and the difference in ANC efficiency is very subtle. The charts also show it. XM3 isn't better at all frequencies, but is better at some and pretty the same at the rest.
What improved hugely is the amount of hiss. XM3 is much better.
Anyway the new firmware supports disabling the annoying "Ambient Mode On" etc, voice prompts, which is something I wanted since they're a bit slow and run over audio.
Unfortunately that also eliminates the short beets signaning which mode is on (ANC<>No ANC<>Ambient) so there's absolutely no feedback.
It's still possible to differentiate since Ambient leaks in, and ANC On has a very subtle hiss, but not ideal. Sony, can you bring the 3 different beeps back?
What do you guys think?