Having read the book and then seeing the movie, I would recommend doing both. When the movie comes out on video I'll see it again.
I didn't feel the relationship between Vermeer and his subject was in any way made more "overt" in the movie and I thought it was in fact very tastefully handled. If anything Vermeer has a protective attitude toward her as if to say that , because she is part of his art, she is above all that.
Being artists I think all of us on the Forum will appreciate the visuals in the movie. I'd rate it