Ditto with GTX780 here.GTX 770, stuttering away. It is a lot better than during Beta but it is still noticeable. It's certainly not game breaking but it is very annoying.
More often than not the sligth stutter (fraps doesn't show any deviation from 60 FPS, but all movement lose their smoothness, feels more like 20 FPS during the stutter) precedes an NPC entering my instance. Happens in open space, happens near planets, happens in stations.