The films of Sergio Leone define the Spaghetti western genre. But this classic by 'the other Sergio' deserves its place in the Top 5 on many fans list of the best movies of the genre.
If Leone's films glamorise the world of the bountry hunter, Corbucci's films take a much bleaker slant. The heroes are only slightly less psychopathic than the bad guys and often they come out second best. There's very little upbeat in Django but it maintains great tension (and violence) throughout.
If you like this look up The Great Silence too. My top 5 spaghetti westerns:
Good, Bad, Ugly
Once Upon A Time West
The Great Silence
Few Dollars More