Board Thread:Versus Debates/@comment-31171723-20170128170340/@comment-25122992-20170208171311

I don't think that Sharingan genjutsu should be a problem for Madara either, especially since his Sharingan mastery exceeds most of the members of Uchiha clan. Normal genjutsu woudn't affect him in the slightest. There's even a chance he can break out from Tsukuyomi with his (E)MS.

It doesn't seem like Itachi was studying Madara's abilities so precisely. Otherwise, he shoudl've easily recognised that Tobi isn't Madara, while there's no sign Itachi ever learned it.

Edit: yep, he just evaded it, while Sasuke tried to keep up with it via his own sword skills. Okay, hands' speed is good, but it's not all you need. And we all know that Itachi is observant, but Madara isn't dumb either, it was him who deduced the mechanics of Sasuke's Amenotejikara or Obito's Kamui after fighting them for a while.