The Agony and the Ecstasy, one of my favorite films. The best part is at night when Michelangelo is up on the scaffolding and the pope climbs up and they discuss one of the paintings. Does anyone remember it?
Have you seen the film Sin, an Italian film (in the language) directed by Andrey Konchalovsky (of Runaway Train fame)? The actor playing Michelangelo is a dead ringer for the famous portrait by Volterra, and the film is about how Michelangelo is caught in the middle of the feud between the de Medici and del Rovere clans.
It's slow-paced but an excellent film. My favorite scenes are those where the troubled Michelangelo has imaginary conversations with his idol, Dante Alighieri (who died 100 or 150 years before Michelangelo was born).