I started reading the Doyle stories just before I picked up the BBC Sherlock, and there's nothing I enjoy more than comparing the two. I love them both equally, as the BBC brought a very fresh and snappy spice to the already spicy original.
I've got to say, though, BBC Sherlock needs to stop with the ship-teasing... we know from the books that John gets married, but I wonder if BBC Sherlock won't go in another direction, the way they dangle ships in front of our faces like they do.
I know for a fact that one of the newer interpretations-- that American version with Watson as a woman-- completely intends to hook the two up. It's obvious. I think it'd be interesting to see Watson and Sherlock explored as a couple in canon. Lord knows we've seen enough fanfiction to know it's what people want...
The dynamic between Sherlock and Watson is my main draw, really. Two completely different people, thrown together to solve mysteries in the most entertaining fashion. Really the ultimate duo.