Went to see Gravity in 3D Imax. It's a tremendous leap forward in the use of 3D cinema to tell a story. The movie is beautiful and the decision to use items moving away from you rather than toward you as action points works perfectly. With a 50something inch HD television on my wall there aren't any other movies I can think of that make it worth going to a theater... but watching Gravity in 2D or a 50 inch screen, or even a standard 3D movie screen... would be like watching a stripper while you're wearing a welding mask.
Go see it, and make sure it's in 3D Imax.
