So taking the best ever pic of Serge (not onstage either), standing alone (with no frame of reference to show his relatively size) and comparing against a random shot onstage of one of today's pros is a fair comparison?

If a guy with Serge's physique were to beat a guy like Rolley at any show everyone would be like, "wtf Rolley dwarfs him!" when they'd see their pics standing together doing similar poses
The only way judging would change is if fans were to push for smaller more aesthetic physiques and question why the bigger guy with the bigger waist beat the smaller - but that never or hardly ever happens.