The best movie about writing?

Is this the best movie about writing?

There are so many movies that are centred around writers, or are about writing and storytelling, but this one seems to be the best... Not only does it work on so many levels, emotionally, on the levels of the characters in the story told and on the level of the nature of storytelling, but it also works cinematically, as a movie... This is probably the most rare aspect...

There are so many other attempts at this, e.g. Adaptation, The Words, even Limitless, but Atonement nails it...