Having read other articles and books by Bordwell in the past, I was not quite sure I even wanted to read the fifth edition I received a few years ago. Bordwell and Thompson are a great team, and they provide plenty of examples for each concept with a writing style which is informative without being dense.
This sixth edition improves upon the fifth edition, primarily by updating many examples to reflect more recent films. Especially interesting is the array of color plates at the center of the book, which helps to make related examples even more vivid.
I am currently using the sixth edition of Film Art in an online class, and the students also seem to really appreciate it - moreso than when I was teaching with the fifth edition several years ago. I am actually looking forward to a seventh edition in the future.