I think Hemsworth has an excellent physique. For an actor of his height (6'3) and particularly for the roles he auditions, I think it looks great. In an IFBB sanctioned event, he would look like a swimmer, but for Hollywood he is an ideal physique to have. He's not too damn big where he typecasts himself into select roles (think the Rock) and he isn't too small where others of similar weight can overshadow him. He's got the right balance and is a good looking dude. Plus, he's Australian and for whatever reason, everyone likes the Aussies.
Also, I think his calves are great, maybe he hadn't worked them out in a bit, but here's another angle that I think highlights solid balance.

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