Board Thread:Naruto Discussions/@comment-25051328-20140818021248/@comment-7292165-20140820021535

Sasuke has the tsukuyomi for goodness sakes. It doesn't say anywhere that Mangekyo Sharingan enhances genjutsu prowess but there is a certain MS technique. If Sasuje just used normal genjutsu just Mangekyo version it would be a jutsu labeled Mangekyo Sharingan: Genjutsu so that's not the case. He has tsukuyomi and has used a couple of times he's just not as proficient as Itachi who had great control over it making several hours of pain in a minute. Sasuke could come adept at it but Itachi was famed for his genjutsu prowess and its not surprising he'd have better control over it.