The smartest guy or gal in the room is the one with the best answer to the problem at hand. It is this simple. It may be true that in a great many contexts this will be the same person, but anyone who assumes they are that person is in most cases being stupid. You have to gather evidence. This is how intelligence works. Intelligences presumes stupidity until it can prove–or reasonably and plausibly conclude–otherwise.
IQ is vastly less important than the problems you can solve. I look up Marilyn Vos Savant, and I don’t see anything interesting: http://en.wikipedia.org/wiki/Marilyn_vos_Savant
Motivation matters. Courage matters. Playfulness matters.