I read an article, "The Sony XM6 are an accomplished set of cans, but they’re not replacing my Sonos Ace anytime soon", at techradar.com/audio/wireless-h… - well written.
However, it's also highly critical of the XM6 for the comfort. I have a few folks on my TL interested in these, so I wanted to weigh in with my perspective too, owning both sets of cans.
For those who have super tiny earholes, or those with very large earflaps, the XM6 may indeed be a lesser-than-ideal fit. Not only are the earcups more shallow, but there's a plastic protrusion in the middle, something the XM line has had and helps with noise canceling, from what I understand. It's not large, about .7 inches long and .4 inches thick, but can dig into those with smaller earholes or if their ears are too large to align it to it comfortably in the earcup. Both can be problems.
The Sonos Ace, however, has far inferior noise cancelation, in my testing. Mids in particular don't get attenuated well at all. It's far heavier, though the workmanship is very solid, with metal hinges (the XM6 has hybrid plastic-metal hinges, Sonos went all-metal on this inside the band.) The choice is yours, but for me, XM6 works well. Not others, maybe, and that's OK.
The Sony XM6 are an accomplished set of cans, but they’re not replacing my Sonos Ace anytime soon
And my reason might not be music to everyone’s earsMax Langridge (TechRadar)

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