An image example of screen qualities. It shows what 4K would mean for image quality compared to the HTC and Oculus current displays.
https://ksr-ugc.imgix.net/assets/018...gif-q=50&q=92&
Illustration from Pimax.
P.S.
It seems direct link does not work. Try this page, the second (animated) illustration in the text, pretty much at the top.
https://vr-world.com/htc-vive-2-neue...splay-samsung/