As does Starter for Ten (although his part is relatively small - the film is recommended for any James McAvoy fans though).
The writers of Sherlock have said that, although the crime solving is interesting, the main point of the series for them is the relationship between Holmes and Watson.
I think Cumberbatch and Freeman carry this off magnificently.
I haven’t seen Parade’s End mentioned. That’s the first thing I saw him in and still my favorite.
Yep, agree on the Histories, though I thought he was better in the stripped down film version of Tinker Tailor than the Turing thing