I dual boot an x1 with windows and Ubuntu. It's shocking how much more performant Ubuntu is. Runs at lower temp (very noticable on thin laptops), smoother, switches between applications faster, everything just runs faster. Ubuntu + X1 is an amazing combo.
This is great - typing this from a X1 7th gen where on Ubuntu 20.04 LTS the internal microphone still does not show up and the 4.0 speakers sound way too crisp (after I upgraded from 19.10, might need to do a fresh installation).
I've been running Linux laptops for many years and I only use Lenovo now (if I cared more about build quality I'd probably go Dell though). I am super excited about this. Absolutely amazing development!