I saw the 'Miles Davis Story' when it was originally broadcast by UK Channel 4 TV and have bought the DVD. On the whole I think it is the best all-round documentary of Miles' life and work and is very good at covering, with little bias, the various periods of Miles' career.
Ian Carr had a major input to this documentary. Element of hero-worship - yes - but also great insight at times. He's also very open to the music recorded late in Miles' career.
Love that bit of film where Miles is doodling away on that sketch pad and doing his best to ignore the fawning interviewer (Jools Holland on 'The Tube', I think).