Haye would wipe the floor with anyone in the HW division barring the two Klitschko's. Haye should get credit for this fight, not because he won but because of the way he won. He done what a lot of people thought he couldn't and knocked Chisora out, not only did he knock him out he boxed the head off someone who people were saying Haye would struggle against.
As for Haye being easily hit, sorry, don't agree at all. Chisora wasn't hitting his chin, he either hit his shoulder, neck or top of the head. It's hard to hit Haye on the chin.
As for a Vitali fight, he could win it, but I don't think he would.