Also I found a Asus ROG ryzen 7 5800H with QHD screen and 3070 8gb and it's 200$ cheaper but question is the 4k screen. How big is the practical difference in editing 4k on QHD screen ?
Editing wise, it likely won't matter. The preview is normally not 1:1 anyways as its in the windows. And If you need to do color accurate work, get a external display. So I don't see a issue with a qhd panel.