Nope, it feels the same as one ui 7.

Yeah, but you can read the changes in the "All Changes" in the update screen for what's new.

Sure, will let you know

I updated and there is no issues

https://www.gsmarena.com/samsung_galaxy_a52s_5g-11039.phpRight under Network -> speeds you have Cat18 mentioned which supports 5CA, so i guess it will support, I got 3 bands when checking netmonster app, so safe to say it atleast supports 3CA