Owned the XM3 and 5. Wondering the same.-

The mic of my XM5 picks up background chatter pretty much, making them difficult to use in calls in the office. The receiver hears my colleagues just as loud as my own voice. I am hoping improvements here. The poly headphones are lightyears ahead in this regard.

As for general noise, it is better, but I am annoyed that an ambient-like mode turns on during calls, negating much of the ANC for me.