The new Sub-Tick Update in CS2 is HUGE!
Before: The shots would be registered INSTANTLY, but characters/weapons animations had 1 tick delay, so they only showed in the next frame. This made it so that shooting in CS2 felt off - a good example is when you get headshots but you're not aiming for the head.
Now: The shots are still registered INSTANTLY, but now the character/weapon animations are VISUALLY synced with your clicks/shots. This makes everything feel so much smoother.
This is a HUGE improvement, what you see is finally what you get. Every weapon will feel better but I believe the AWP will be the one where you see the biggest improvement as you only shoot it once at a time, USP in pistol rounds too (when tapping moving targets).
This test video was done by u/kubpica, was going to test it but this video shows it perfectly so credits to him.