I discovered the films of Stanley Kubrick about 4 years ago, and since then I have watched his films many times and studied them in depth. I believe that all of his films are greater than the books they are based on. I believe that his films have more intellectual depth, are made with more skill and talent than almost any book. I cannot say this about any other filmmaker. Kubrick also put years of research into all of his films, claiming to read "every available book" on the subjects which his films were based on.
If you haven't seen these films, they are masterpieces and you should watch them ASAP:
>2001: A Space Odyssey
>A Clockwork Orange
>Full Metal Jacket
>Eyes Wide Shut