I wonder if the new gen is a process node jump, or a hybrid of the current product...
I decided to not upgrade to the new gen nvidia gpu... I may give it a go if you see that huge jump as nvidia is typical to give with the higher end '80/ti chips/models. The 1K+ pricetag on a 2080ti wasn't worth it for me, even as an also gamer that is stuck at home 90% of the time.
about the gaming part..
2080ti earned a premium to be the first true 4k gaming gpu that can pull a good amount of FPS. going 4k, 2080ti and above performance (upcoming GPUs) you should consider a new monitor ultraHD/4k blah blah stuff.
I'm using a 1920x1200 24inch monitor for gaming, a 1920x1200 resolution for 1080ti will play new games at max/ultra settings..but you can and if you push the limits of 1080ti you'll see the difference. (not to mention there is an "enable RTX" on some games)
here is the trick, use the nvidia "custom resolution", i tried (my monitor aspect ratio is 16:10)
2560x1600 - ideal for 1080ti, more clear gaming, this is 1440p for 16:9 aspect ratio
3840x2400 - this is 4k zone, 1080ti gaming got a bit of stickiness to it, i bet 2080ti can do this like 1080ti to a 2560x1600
4096x2560 - this will be the 3080ti area...
3080ti will be the 4k gaming at ~100 and above FPS, specially now that monitors can do 144hz.
some games have a memory fill bar while adjusting settings, 11gb gets filled at 3840x2400, that's why 3080ti gets a 16gb of memory. 2080ti still has 11gb.
custom resolution works, even if you have a 1080p monitor, try playing a 1080p video and try playing a 4k video, generally 4k is still much clearer. the video delivered to you is 4k, the gpu delivered to you is 1440p even at 1080p monitor you'll see the difference.