Even a 1080Ti can do 4k 60 with a mixture of high-ultra.
I prefer high refresh especially with K+M and my TV is just for controller based games.
A 2080Ti can do a constant 4k 60hz ultra on the vast majority of games. But then you have the cost etc. More than twice as fast as a 2060, even more so overclocked for info.
It's tempting tbh, as I have a nice 4k TV I could use for games I prefer on big screen and sat further away like AC and Forza. Would depend if my SF600 Platinum PSU is up for the job as I cba changing that too.

Plus, she owes me now since I upgraded her stuff. I've been bomb dropping hints for WC'ing bits for a while, it'll sink in at some point