[Optimus_Prime_]

Also, we know little about Vader, even if he is human until the second movie, because the mask and the suit hide every meaningful way of knowing him, so all we have is that voice.

Bane.

Bane we know is just a man. A powerful one, but just a man. He's more like a James Bond villain, and I like the Shredder comparison as well.

But Vader.

Vader has superpowers also, like big time, "even this Deathstar pales in comparison to the force" powers. I just don't see this as much of a valid comparison.