“The Doctor is an angel who aspires to be human. Sherlock Holmes is a human who aspires to be a god.” Here’s a great interview with Doctor Who and Sherlock writer Steven Moffat from 2010:
I’m one of the few people who didn’t ask “Matt who?” when the new Doctor was announced, partly because I’d hoped we might be able to cast him in Lady Audley’s Secret. I first saw him in the original cast of Burn/ Chatroom / Citizenship, the 2005 triple bill at the National that also featured Andrea Riseborough, Andrew Garfield and Naomi Bentley and should therefore be awarded some kind of post-dated casting BAFTA, and then in Party Animals and The Shadow in the North. The range of roles that he has played so far promises a mercurial, dangerous Doctor, and as Steven Moffatt is the writer of my favourite episodes so far (The Girl in the Fireplace and Blink), spring 2010 can’t come fast enough.