My hands are average so I haven’t had an issue. I bought used and it came with a thumb grip. Also I keep a leather shell case on it, feeds into the retro look and adds some bulk. At no point have I found it uncomfortable and no one else who has picked it up has complained given what I’ve added to it.
I have a second hand surface still running windows that I draw on. With a paper like screen protector I find it quite pleasant. Mines a 6 I think, runs Krita great I imagine it’d be even better if I ditched windows bloat.