That's arguable. Sasuke can paralyze and go into people's minds, along with force them into his realm, but that's all we've seen him do. Kakashi can copy jutsu's, and of course, he has MS.
Where'd you get that from?
That doesn't mean he isn't capable of doing so. Also, Kakashi's second encounter with Itachi says otherwise. He moved pretty quickly. Something Sasuke was never shown to do before. Remember, Kakashi is Gai's rival, and Gai is most likely faster than both Kakashi and Sasuke.
I wouldn't say easily. But it's not like Sasuke has totally surpassed Kakashi in every other way.
But, we've already done this so many times. =\
I'm sure Neji has something in store for Lee when and if he opens the gates against him. He's a Hyuuga genius, and much more skilled with taijutsu than Lee. Lee's style is all about speed and power, and he's ridiculously straight forward in his attacks. The perfect enemy for a Hyuuga as skilled as Neji. Besides, Neji has already beaten Lee before, so it's not like he's the one that has anything to prove.