Just got the AirPods Pro today. Quick impressions:
* AirPods Pro has a typical V-shaped sound - slightly boosted bass and treble is raised a bit. The treble can get a bit shrilled depending on the song. It sounds noticeably better with ANC on rather than off, strangely, and soundstage is a bit boxed in. In general it's a good enough signature for a pair of True Wireless Earbuds and is not offensive to my ears, maybe even a bit too much bass for my preference in fact.
However you shouldn't forget that iOS doesn't have a system wide EQ, whereas the WF-1000XM3 does when programmed via the Sony app. If you don't like the sound of the AirPods Pro, you are stuck with it. Whereas if you spend a bit of time EQing the M3, you should get it to sound very close to what you want.
* The touch control on the AirPods Pro absolutely sucks - probably the worst of all TWE I've ever tried. That stem is just not in the right position to be squeezed and there is no tactile feedback, and the only sound that alerts you is a tiny "click". Apple probably expects you to either use Hey Siri or the Apple Watch to control playback.
* Comfort is good - it doesn't require a deep insert so it feels a bit weird when switching from the M3, they are also very light, so you kinda don't even know if they are seated properly or not, actually feels a little weird without the weighty assurance. The eartips are proprietary - if they fit you you are good, if not, you are out of luck as you won't be tip rolling. There's also a metal filter on the eartips, I wonder if removing it will change the sound, but since I don't have any replacements I can't take that risk....
* Features - as expected, full Apple integration will give you the best no fuss pairing experience, just flip the case open and it pairs magically. Video/audio sync is spot on, it even syncs up with games (advantage of having everything in house). If you watch movies and game on your phone, hard to beat this.
* Case - AirPods Pro definitely have the better case - smaller with wireless charging, holds about the same charges etc.
tl;dr AirPod Pros or M3 is going to depend on your usage. For music I think M3 is still better, if you use a bit of everything on your phone and you are an iPhone user, then the AirPods Pro is worth a look, but you have to watch out for the trappings like no EQ and no tip rolling.