Sasuke's speed was unweighted Lee's speed in Part 1. But his speed feats were more pronounced after the time skip when he was still 3T. When he fought Naruto at the hideout he went from standing on a ledge talking down to him, and suddenly in an instant came right up to him and was about to stick a sword in his back until Sai rescued him. He also was able to defeat 100s of Oto-nin without getting a scratch or drop of blood on him. And in the North Hideout he destroyed many CM2 ninjas using purely his speed and kenjutsu.
Kakashi's speed is underrated too, but Sasuke is simply better.