120fps feels smoother and if you go back to 60fps right after it feels sluggish but honestly it doesnt affect your gameplay at all. Now from 1080p to 4k the image clarity is much better, you can see much more details.
Been using Apex 4 for months, got it on sale and its been amazing, got a kirby riding his star as the screen gif. It may be noisy but everything else is spot on