I'm no expert of competition posing. But Arnold, would always say to open up the chest. Not sure whether its the camera angle, but many of the poses the Kai does seems to close him up. Overall yes he has more mass. Olympia is judged by the overall package, and reading what's being said by people who were actually there, Phil, killed the posing side of things.
Personally I think Shaun Rhoden, is my favourite in terms of overall upper body asthetics - lats, abs, chest. But then you look at those calves, lets him down heaps.