@John This is a great review of a really good movie.
I agree with your assessment that there are so many more layers to this story than simply 'climbing a mountain'. I feel like the filmmakers did a great job balancing so many different perspectives into one movie. Based partly on your review I purchased the movie instead of renting it, and I'm very glad I did. I have watched it twice now already (finally bought it last week) and it seems like one of those movies where you are going to pick up something different each time you watch it. Thanks for sharing your thoughts!