Heh for some reason I've never actually thought of pairing up these 2 in a match for some odd reason...But all in all with what everyone's saying, I think as of the CURRENT moment, without giving anything away or anything, I think Kimi would come out on top for tons of reasons plus all the ones people have listed, because sasuke isn't developed enough yet, he has way more room to grow. BUT, extrapolating to a later time, let's say when sasuke is developed, like Itachi is (who, as strong as he is, is still like what...16?17?), then Sasuke might be the one who come out on top. A very perspective-driven argument hah (on a side note, since I'm Pro-Itachi, I'd probably go with sasuke in a later scenario hah =D).