If Tommy Hearns or John Mugabi could not knock him down or out no one could . Hearns and Mugabi didn't just hit Marvin, they both hit him clean and with Hearns he was rocked but he kept going and with Mugabi he barely reacted. I saw the Hearns fight and said wow Marvin can take a punch, and then he fought Mugabi and I thought. So this is no joke. The man's chin is incredible. Two of the hardest punchers in history and he doesn't react. both Hearns and Mugabi said after that Marvin had an incredibly hard head. Julian had a different kind of power.. He had leverage with his whole body.. Hearns hit with speed and back to front power,,, Julian hit with side to side hook power.