I am using a 4080 on Plasma 6 wayland. It works pretty well. DLSS works. I haven’t tried frame generation, but I think support was added recently. Occasionally I have a wake problem, but I believe that is bios related. I am encountering a gamescope blackscreen freezing issue.
Only stuttering I am experiencing is a Steam overlay bug and Bluetooth interference sometimes.
Compositor choice and how recent of release will effect your experience as they are all independent implementations and still improving.
I wouldn’t expect that a 20 series card to be a specifically buggier experience over the 40 and 30 series though.
Glad they came to their senses. I had trouble setting up one as I have/had a sony group account with no security info which is needed to reset the password. Turns out sony doesn’t filter periods from usernames from email. Just ended up adding a couple to my email address for a new account.