Well can't say anything but agree with you. I'm not sure that I would be so charmed with BC if I saw his previous films earlier than I watched Sherlock. Sherlock Holmes though he never existed in reality sometimes seems more real than living beings, and actor who manages to portray him well gets a ton of his charisma in back.
In spite of SH is being adapted so many times, there are only some of actors who are well known for playing this role: Jeremy Brett, Basil Rathbone, Livanov and now BC. What can i say - good luck for him, and really good job done.
I can say that there's only one movie which could impress me perhaps as much as Sherlock, if i happened to watch it earlier: Hawking. It's just a masterpiece, and BC is brilliant there, i loved the movie since i first watched it and have already re watched it a million times )