Are you running it via Xwayland? If you compile Emacs with ./configure --with-pgtk, the blurriness disappears. It’s a fractional scaling thing that does not interoperate well with X stuff.

I'm on mac so unfortunately not, I've done a lot of hacking to get my fonts looking mostly correct though.

I've noticed a lot of screenshots and screenshares of people using emacs look similarly blurry though including the screenshots in this blog post.

Interesting. Fonts looks beautifully sharp in Emacs on my Mac. I don't use any variable-width fonts however, only monospace.