Zero.
I wouldn't call them better than previous K-T ones, look at the resolution issues, 2D assets issues, CPU utilization issues, framepacing graph during movie playback, etc.
It's just that Durante knows how to handle those things better than most of PC gamers, so we came prepared.
I dunno, it seems like the only issues they have are just minor in the grand scheme of things, certainly much better than most of their other stuff.
The 2D assets are such a weird thing to get hung up about. Yeah, it's stupid, but at the end of the day it's just menus looking slightly fuzzy, but everything else looking better than on PS4.
CPU utilization is another thing that's stupid, but doesn't really matter that much.
They definitely should get their shit together with resolution support though, it can't be that hard to just query the damn OS instead of hardcoding values.
They support all the ones I personally need but I can see how this can be annoying.
But at the end of the day, to me those are some minor inconveniences that I hope they'll patch, but even in its current state there's nothing actively hampering my enjoyment.
It probably helps that Atelier itself is damn good.