Sasuke should take this even before MS at 3Tomoe level due to his Raiton advantage. He has displayed tremendous speed on several occasions, along with impressive kenjutsu skills. At close range combat, Sasuke absolutely destroys him with Kusanagi, Nagashi, or Chidori and 3T Sharingan will give him the advantage of avoiding any tough attacks.
Also, at close range Kimimaru is completely vulnerable to 3T Genjutsu. This also goes against him. At MS level, a single 'focused' Amaterasu kills him. zero - Low difference win at MS and low - mid difference win at 3T.