Personally, i can't name this a sequel, because it's very good this way almost without the first part. Al Pacino is very great in this role and i think this guy sets some standards in the industry and many actors have learned from his acting role. FF Coppola is a genius, made a great job with this film too, and the fact that this part alongside with the first are in top 10 IMDb is a recognition from the viewers. You can't see the first and not to watch this movie too. Enjoy!