Barrett and Sheamus are both around the 6'5/6'6 mark which is bigger than Rock, Austin or HHH, but I guess if you're talking muscle mass/definition then Rock/HHH beat all four. I think Sheamus is pretty damn ripped, it's just that he's so pale so it shows barely any definition.This right here. Only thing I don't like about these guys is they're a little smaller than I'd like (I prefer bigger wrestlers, a la HHH, Taker, Batista, Austin, Rock, etc).
I also really like Sheamus, I think he's fantastic in-ring and I'd like to see him involved in a good storyline leading up to WM. I do fear that he's becoming too much of a babyface, I think he'd work well as a tweener/heel that gains respect through his wrestling/character.