Perfect Symmetry = Flex, Kevin, Shawn
I agree with picking Shawn out as having perfect symmetry but the other two?.....er, no
Perfect symmetry is having everything in proportion, good balance....Kevin didnt have that, his physique was dominated by his triceps and shoulders.....when you've got bodyparts as dominant as that it throws of his symmetry, it was a pleasing physique but it had strong parts (shoulders and tris) and weak parts (back and later in his career legs) and so i find it hard to label him as 'perfect'....
....the same to a certain extent with Flex, early in his career (1993) it was all there, balance, proportion, no weakness but later in his career he fell into the trap of becoming a shoulders and arms bodybuilder....his later years he just looked daft.....his oil filled arms and shoulders dwarfed his back and chest (muscles which should be the largest on the upper body were looking small next to his puffed up arms and delts)..... he also became known for his arms....
...the mark of a truly symmetrical bodybuilder is that no single bodypart dominates, there is balance between upper and lower body, your eyes arent drawn to a particular muscle because they're all equally developed.... Kevin in 1992 and Flex in 1993 had this but then lost it.
The guy in the photo on this thread has superb symmetry, no single bodypart takes attention from any of the others, there is good balance between legs and upper body.....that is great symmetry, Shawn had it and Milos had it too.