He gets past Naruto with some effort, then gets through Luffy again with some effort, but I think he falls to Ichigo. His level is still not clear at all, but if my assumptions are correct Ichigo is op'ed right now. Actually I'm quite certain that Naruto and Ichigo are right around the corner from another upgrade, but as it stands I'd say Yusuke is 2 for 3 with effort.
@SMXLR8: What's you're point? We know there are animes and manga above DBZ, doesn't change the fact that he is is a lot stronger than everyone in the HST combined, not only because of speed because of every stat he has.