Thus, it is fulfilled in this case that the actors make each other shine.

I would disagree about Tom Hanks shining in this film. His character Langdon shines with his highly intellectual mind, but not the actor behind it. To be fair, I don't think any actor would have done much better job anyway because Langdon as a character is more robotic than human-like.
I think the actor who shone the brightest there was Paul Bettany.