And, more importantly, how much do you care?
Assuming that the appearance of the real-life person is not in some way inextricably tied to his/her story, do you notice or care how much the actor playing the movie role resembles him or her? If so, are you swayed at all by how well the actor pics up on other aspects - mannerisms, speech, etc. - of the person?
And aside from the fact that they’re both totally gorgeous, I . . . don’t really see it.
How much it will bother me, however, will depend, I think, on the movie.
I mean, I never would have chosen Philip Seymour Hoffman to play Truman Capote . . .