Opinions are subjective, and we are all entitled to one, and it is my firm opinion that Fedor will never be matched as a HW in my lifetime. Mir doesnt come close and would have been demolished as easily as most of his opponents, infact Mir may very well be one of the most overrated fighters of the modern era. Whenever he has had to step up he has been destroyed and left in a bloody mess, for whatever reason he just hasnt been able to establish himself amongst the elite.
This is as pointless discussion as the Yates / Coleman debate as there are always those who swear by either guy, and those who have no opinion on either.