I first saw this on broadcast TV in the early 80's as a late night movie and now have it on DVD available here ---> http://www.amazon.com/Ali- The-Fighter-Muhammad/dp/B0007LPSIQ
Fans of the sport and the fighters get the entire fight without commentary from various angles including ringside to give the 'you are there' feel.
The promoters allowed cameras behind the scenes of financial discussions about the event and viewers are given a look into the personal lives and personalities of the fighters. The producers evidently wanted to provide every perspective possible as it happened leading up to the fight including speculation of sport writers and fans and members of the fighters' teams.
The film also provides insight into the societal attitudes of the time. Frazier's manager is asked why black investors where not involved and the sore subject of Ali's draft refusal comes up more than once.
In giving such detailed insight, this movie did an excellent job of showing future generations why this event transcended boxing and sports.