I have not read the book, but I did watch the movie in the theater. At the end of this film, I was sobbing uncontrollably in my seat, and I wasn't alone! When the credits started rolling, people were either silent and still in their seat, or crying.
It was an incredible movie, but boy, I had to sit in my car and finish crying before I left the parking lot. I hadn't cried so hard during a movie since Life is Beautiful.