Instead of looking at the whole soundtrack, I'll just post 3 versions of Skyfall that I really like, of course including Adele's version. Not in any particular order except for the order in which I heard them.
Adele - Skyfall
Josie Charlwood - Skyfall
Brilliant singer from England, check out her facebookpage for more of her music!
Marjoram - Skyfall
Local (Groningen, The Netherlands) talent!