Best line up ever in my opinion. You really can't judge a contest by guys just standing around in 1 pic and not flexing. If you see the other pics of that years Olympia , Sergio beats Arnold hands down. For a guy like Sergio, his height and weight, he has put on as much muscle as humanly possible. Now for Arnold, he is taller and weighs more and is naturally a bigger guy, but Sergio is matching Arnold in every pose and category and beating him. So I would say Sergio looks the best there and I would have given him this Olympia easy.
P.S. Serge Nubret abs looks awesome in that pic.