With every thing in the world there will always be new things to learn. As the world changes long held beliefs fall and so you must continue to nurture your expertise or you will stagnate and fall by the wayside.
Jiro Dreams of Sushi is balanced between the story of a remote and complex father and capturing the fine art of making sushi and photographing it in the immediacy of its freshness. It is also filled with surprises -- like watching how someone gets a live octopus into a plastic bag!
If you enjoy sushi, consider yourself to be a foodie or are simply fascinated by people who have mastered their craft, David Gelb's documentary Jiro Dreams of Sushi should top your list of movies to see next.