i do agree Sasuke has those ups, but at that point, Neji was still beating Rock Lee easily because Rock Lee tells Naruto that he wants to be the one to finally prove that hardwork>genius. I also dont know if Chidori would go through rotation..i mean both are pretty powerful attacks, only rotation is like one of the ultimate defenses against stuff.Sasuke for a couple of reasons.
1) He would have beat the gaara that lee couldn't beat, and lee more or less neji's equal.
2) Has lee's base speed + sharingan for prediction, and has chidori to overpower neji's rotation
3) If need be he has the curse mark for a chakra increase and speed higher than base lee.
Sasuke wasnt suppose to using the curse mark during the fight so i wonder if he would have used it? The only reason he did is because Oro had that sound guy against Sasuke and he was trying to force him to use the curse power. hmm...