One of things I noticed right off about SHERLOCK that I loved was the soundtrack, the nod to Victorian London in the title theme, I can only think (for tv) of Twin Peaks as being as atmospheric in terms of sound.

(listen to samples)
http://www.amazon.co.uk/Sherlock-Soundtrack-TV/dp/B006QXQTBY/ref=sr_1_1?ie=UTF8&s=dmusic&qid=1325162053&sr=1-1

(listen to samples)
http://www.amazon.co.uk/Sherlock-Soundtrack-TV/dp/B006QXQTBY/ref=sr_1_1?ie=UTF8&s=dmusic&qid=1325162053&sr=1-1