Dorian was the first mass monster to win the O and has that as his legacy.
Schwarzennger's career speaks for itself and he is the Babe Ruth of bodybuilding.
Coleman was just an amazing physical specimen with his mass but I have to be honest and say that Yates, Coleman and Cutler have unappealing physiques for champions. My favorite all-time Olympia physique is Sergio Oliva.
Haney is the true standard IMO.