I just installed Big Sur 11.1 (I have been holding on to Catalina for the last weeks) and I can tell the difference.
The system feels incredibly laggy. UI bugs, slow user experience and it definitely does not feel polished at all.
MacBook Pro (16-inch, 2019)
Processor: 2,3 GHz 8-Core Intel Core i9
Memory: 32 GB 2667 MHz DDR4
Graphics: Intel UHD Graphics 630 1536 MB // AMD Radeon Pro 5500M 8 GB