((Let's just combine these shows into one, so that we can have WhoLock. And also, the Sherlock hiatus can FINALLY end.))>> Actually there is one difference it's that in Doctor Who there running from danger while in Sherlock There running to danger.
Matt smith originally auditioned for the role of sherlock in the BBC show, but Benedict cumberbatch was chosen over him. But Steven liked his acting so much he promised him a role in one of his shows. That show was doctor who.