GasparZizou
Super Freak
All depends on the artist. Most depict Superman as bigger but others have expressed the view that Superman's strength isn't deprived by his physique.
It's not the same thing, neither WW or Supergirl are anywhere near as strong as Supes and Superman's strength does depend on his muscle, like any other being that has muscles, why wouldn't it?This is true, same factors for Wonder Woman. She sometimes is drawn more "cheesecake" whereas others draw her in a Herculian style of muscle.
The fact that even being skinny like in the Flashpoint paradox he still has superstrength doesn't mean he wouldn't be stronger if he had more muscle, that is one of Superman's weakest versions.
Also, Superman strength may not depend on his muscle in a way that is perceivable to us, but his muscle DOES depend from the sun, as long as he gets sun he will have a peak muscular form.