A 3080 10gb is 69-71% the performance of a 9070 xt, so you’d see a pretty big jump in raw fps. For ray tracing, the 3080 is 60-76% the performance, so a similar increase there. It’s also worth keeping in mind these numbers are from the 9070xt launch, and other benchmarks have found the performance increased over time (nearly 10% iirc), so this is probably a lowball of the difference.
It’s also a much quieter card in general, though this depends a lot on the specific variant of each card you have.
I’m in the same boat with a 3080 10gb and I was really itching to snag one when the 9070xt first dropped, but personally I decided to be patient and wait for AMD’s next gen to grab an 80 class gpu (I run 4K so kinda need it).
I have the M3 and love it, but it’s not a particularly quiet mouse so may not be the biggest upgrade sound-wise