Arnold - 1973 Mr. O - Best balance of extreme mass with aesthetics.
Coleman - 1999 Mr. O Most separated big man man with shape and WOW factor.
3rd-
Yates 1993? His arms and legs never looked this good again in competition. Onion skin; grainy hard!
Bannout 1983? Plenty of size for his frame, extreme separation and striations with great aesthetics.
Heath 2011? Incredible WOW factor with probably the roundest muscles ever; great separation!