Have you ever read The Curious Casebook of Inspector Hanshichi? by Okamoto Kido? The main character was a deductive thinker and Tokugawa-era detective that solved "unsolvable" cases. He had a lot in common with Holmes!
I love Brett's cool/manic lizard-like Holmes very much. He is my Official Sherlock Holmes. --But if you were to make him younger and handsomer and put him in modern London, I don't think you could do much better than Cumberbatch. His performance is quite similar to Brett's, and I think that is why I like it.