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You notice it most with the newer lenses tbh, but it's massively better.
I've only got two lenses - the 35mm F1.4 and the 56mm F1.2, the Xpro-1 seems to have more issues with the latter, but with both I have to switch to manual focus in lower light conditions.
Dammit-
I think those lenses are the ones where you'll see the least improvement, as they both involve moving a lot of heavy glass around. Of the first gen lenses, with the 18mm it's pretty snappy, but still hunts back and forward a bit. The motors in the new f2 lenses seem to lock on much more quickly and surely, for some reason, and my 16mm focuses fine - but it's a super wide, so it's not so much of a challenge.
Edit to add - it does lock on, though, just not as quickly as with the new lenses. Using back button focus helps a bit as well.
h2o
You notice it most with the newer lenses tbh, but it's massively better.