Sorry, Redguard...it's Martin Luther (unless I am wrong...LOL). I've only seen the ads for it, but I DO know that Colin Firth's brother, Jonathon, is in it! Lol! I would suggest going to google and doing a search for reviews or historical accuracy. Here is the link to rotten tomatoes...they give reviews and such...hope this helps!
I'm not sure how much I should say about the accuracy because I'm not as familiar with Luther's life as other parts of history but from what I understand it's pretty accurate. The only problem is that it has a bunch of historical events and people but doesn't explain their importance much. Personally I think it would have been a better movie if it had fewer historical events and focus more on the person of Luther. On the other hand seeing those historical events but not completely understanding them may make people curious and study Luther's life where if the movie was simpler to understand it wouldn't stir up as much interest in studying him.