I checked out his workout routines... Tons of high-rep low weight stuff; i.e., bodybuilding exercises. IMO, he's all bulked-up and, therefore, too slow, relatively speaking. But I'd love to see him in a regulation boxing match with Klitschko, say.
He wouldn’t beat a 3rd rate amateur in a boxing match, never mind Klitschko, and that body is a product of drugs and LOTS of them.