This is one of the unusual cases in which a movie and the novel on which it is based are both great. Maybe this is because Gorris' takes Nabokov's initial ideas and gives them a different interpretation. The final consequence is a point of view over Luzhin which dignifies him more than the Nabokov's one.
The only thing in the movie which I don't like is the influence of Valentinov's on Luzhin's destiny. I can't imagine Nabokov creating a person like Valentinov and giving him so great influence on novel's argument.