Mark Henry could pull 18-wheelers, and bend cast iron frying pans in half. Actually, there is a story about that. They were supposed to give him a fake frying pan, but as a rib somebody got him a real cast iron one. After he bent the thing for real, his respect in the locker room went up a lot.
I has been stated many times in a no-holds barred fight, Haku would beat most people. But in a fight with rules, Brock would stand a better chance.
P.S.
It was said that Haku was also the only person Andre the Giant feared, as in didn't want to get mad.