It's impossible to say Fedor didn't juice as well when he had his prime run, but he certainly didn't look like it. In all aspects of MMA though Fedor in his prime was faster, more skilled and infact did punch harder than HW Overeem. Remember when Fedor was in his prime in the HW division Overeem was running around as a skinny LHW. He juiced his brains out to get where he is today. Fedor hit just as hard and probably harder but was immensely more skilled. Overeem would "have" to respect Fedor's power so that means Fedor would have grounded him quickly...and then it's just a matter of time. No HW, not even Cain (whom I do really like), can match with Fedor in his prime. Fedor beat everybody in every skill set.