Sucky is correct in his midsection statement. At the 98 and 99 Olympias as seen on video, Ronnie midsection was horrible in terms of detail. When he went to hit an ab shot, not detail or anything popped out. In contrast, Dorian's midsection in 93 was awesome, if he did have a wide waist or bloated obliques he hid it very well in his posing routine!
With that being said, a detailed midsection and calves are never enough to make up for inferior quads, arms, and chest. In my opinion, Ronnie and Dorian's back's (99 v 93) are too close to call, they are extremely similar).