Same! However, I've never actually used Catalina for a significant period of time, so I can't compare them directly. I downgraded back to High Sierra after just using Mojave for a few weeks, partly because I was frustrated with TCC breaking my scripts, but also because I'd noticed Mojave was slower and buggier than High Sierra. When Catalina came out and the problem reports started rolling in, I resolved not to touch it with a ten-foot pole.
I only installed Big Sur because I wanted to try out the new design. I was fully expecting a dumpster-fire, and I wouldn't have even blamed Apple for it, given that Big Sur is currently an early developer preview (I was only able to download it by hacking Apple's catalog URLs). I did not expect to actually like the Big Sur.
There are a couple of odd bugs that I expect to get ironed out by the fall—for example, the menu bar sometimes shows a wifi-disconnected icon even when the internet is working fine. On the whole though, I think the current build of Big Sur would make for a fine daily driver. (Although it would probably still be a bad idea if you're working on something important!)
More than anything else—and I know this will be very hardware-specific—I just can't overstate how fast Big Sur feels. It's really as if I got a new computer. I will note that I did a clean install, but I do those regularly anyway, and they don't help all that much.