Clay-London
http://youtube.com/watch?v=jU2YPXghFkU

This is what the greatest looks like when he's firing on all cylinders. Notice the triple feint he uses to back him into a corner followed by a 10+ punch flurry. When someone can keep their hands at their side for an entire fight over the course of many fights and still make people afraid to hit them only using the fear of their speed, you can't compare them to anyone.