Like I said, I'm rereading the book now and it's mainly the depth and the rhythm of the story that make it excellent.
In the movie everything is a whole lot more simplistic (by necessity, you can't transport every detail from page to screen).

It's fun having a story told in different ways via different media, makes the interpretation more interesting, because a movie is really the directors interpretation to a story, so with the book and your own interpretation you can see what you focus on and what other people might focus on.