Here's the one of the most perfected human physiques, in his prime in street clothes. Doesn't look out of place at all.
Bodybuilder doesn't always mean juice monkey, surprises me that a professional artist like JamalYIngle can't tell the difference.
As far as all incarnations being fair game tho, how would you feel if a movie was made with Shuster and Siegel's original depiction of Superman where he's abusing women and amusing himself with one liners while using lethal force? It wouldn't bother me, but I imagine a lot of others would be.
I think th esource material that should be used should be the most contemporary. Look how well Schumachers' Ode to West fared against Nolan's Miller inspired movie.