Actually, Hearns was known for his speed (his hands were incredibly fast) and punch which he's height/weight ratio made it hard to imagine. Tyson was very fast for a Heavyweight which is whole different story (and that was also because he was much shorter than most Heavyweights). You have to compare things that are comparable. I don't think you've seen Hearns fight that much. i love prime time Tyson but the fact is that he didn't face that good a competition.
comparable? Then you can't mention a chimapnzee like thomas fighting against a gorilla who is just as fast and agile like mike.
who cares about mesures? Reminds me how people allways diss buakaw that; "Yeah but buakaw wasn't injured so it was easyer", yeah, because he is the better conditioned athlete so that's why he's not injured, doh

Mike tyson was short, big, fast, powerfull and accurate = makes him the overall better athlete and boxer.
but I'm a fanboy here, though.