Yeah, I'm very much not a Sherlock snob, so I can't compare how it when you have a strong attachment to canon (the version of Sherlock Holmes I'm the most familiar with is the Ghibli version, so); but I've seen several people who are fan of the books like the movie as well. It's definitely more... pulp, but wonderfully so. As I said above, I don't remember enjoying an entertainment movie so much since Pirate of the Carribbean.