I'm in a weird upgrade bind, my current rigs have these cards:
Desk PC: 1080 Ti
HTCP on 1080p TV: 980 (not Ti)
Even though my Desk PC has a 21:9 3440x1440 monitor, I don't really play anything where I notice any performance degradation. In the same way, I haven't played anything where the 980 in my HTPC has presented problems, but I'm going to upgrade that TV to an HDR 4k TV this year (in the next month or two probably), so I will definitely want an upgrade. The HTPC is in a mITX case though (Silverstone RVZ02) which has length and height restrictions, so I'm not sure any of these cards would fit (though I can run it open on the top where the GPU is if i want, just have to keep it dusted.
I guess I'll wait and see what the 4k performance is of these and see if it's worth upgrading when there's actual benchmarks.