That's the only thing I have to see in (high rez) benchmarks / tests, how good or bad do those presets look, but AMD said is not a big difference on Ultra and frankly, even Ultra gives enough performance for me.
Also all the leaks so far said it's like a DLSS 1.5, not 1.0. So yeah I'll wait for those confirmations, but even if they are behind nvidia at this point, the rate of adoption and advancement this tech will have since it's open source will surpass DLSS 2.1 fast. I think nvidia soon will have to just embrace this tech and forget about DLSS (just my opinion).
edit: AMD uploaded the 4k video of FSR
View: https://www.youtube.com/watch?v=eHPmkJzwOFc
Looks like it's indeed good enough and better than DLSS 1.0.