I saw the original Django on netflix maybe a year or two ago, it was good, essentially, the first "rough" western, with blood and guts.
Django took westerns to the next level, from all clean and "G" rated style to more gritty "R" rated films.
I see Django Unchained as Tarantino pushing the envelope even further.
Sukiyaki Western Django was annoying at first, then bizarre, and then, finally awesome. With Tarantino essentially doing a bad Japanese accent doing a bad western accent. (Don't get me wrong, I love Miike's directing, perhaps even more than Tarantino's)
Django Unchained was just fvcking awesome. several scenes in that film had me at the edge of my seat, other scenes had me laughing very loud. It's the first film I've opted to go and buy a ticket to see since Moon (I buy a lot of blurays otherwise, and watch a lot of netflix, or rent a lot of redbox, but, I was not patient for this one.)
I love this movie.