I've seen his Immortals footage, his Clark Pics, his press stuff quite recently. It may seem trivial to some, but you don't selectively grow huge shoulders, upper arms and chest by that much in such a short period of time. I know what I'm talking about.
And Evans' arms and legs are nowhere near the size we see here on Cavil, his frame is just quite a bit wider than Cavil's. And as for Hardy's Bane, I've expressed my disappointment in his physical appearance quite a few times now, compared to the source material it's pathetic really, Bale looked bigger in Begins.