Sex god? Sure. I've perused the soap caps and they have my stain of approval. I MEAN STAMP. I said stamp.
Heavily-muscled, though? Muh. We've all seen far more mesomorphic physiques. Not better physiques, mind you...it's not a matter of whether he's fit or not, it's a matter of "Wait you guys went looking for a Norse battlegod and this is what you ended up with?"
This Hemsworth guy is a regular Adonis, which is great for him, except that Thor shouldn't reflect that pantheon's standards of male fitness, if you catch my meaning. Thor's a powerhouse. Practically a meathead. All I'm saying is, this guy's audition had better have been a frakkin' masterpiece.
Now watch me eat my words raw in a few months when it turns out he's packed on thirty pounds of muscle.