Board Thread:Naruto Discussions/@comment-25498052-20141004162612/@comment-17623-20141006121610

And Sasuke didn't come out the womb with a three tomoe Sharingan ready to plague the world. Natural part of his body it may be, but the fact it has to one awaken and two, turn on means it's not his base form.

And even if it was, it wouldn't change my reasoning all that much. As I said, at base Sasuke would wreck Naruto. It's when the upgrades start piling on does it slide heavily in Naruto's favor.