1080ti: some games yes. Most AAA power hungry titles? no.
1180: it will be better but then games get more demanding.
4k also has scaling issues in general use. You need to up the scaling to see text & icons & this affects programs that aren't coded for the high DPI. Even windows & steam still cant get it right, let alone the myriad of other software one might use.
I suggest focusing on fluent performance with 1440p on a large, 30+ inch monitor.