Are your thighs the right size for your body? Now sit flat on the floor....do they look too wide? Same thing.
He looks fine to me....as long as you can feel his ribs, he's good. You don't want to be seeing them.
If you're worried about HD for some specific reason, you can have him x-rayed when you have him under for neutering. (PennHIP x-ray is specific and more exact for HD and only some vets do this...but regular x-ray can show also.)