Well, Naruto is able land a few punches on him and Naruto wasn't using full power when he did that.
We haven't even seen Sasuke's full EMS powers yet. If he was free to kill Kabuto he might've used it all.
Untill then, every prediction of Sasuke's powers is inaccurate.
And remember,.. Kishi himself frequently says Naruto and Sasuke equal.