It's available on an amazing 2 DVD set that also includes Jammin' the Blues, the Dizzy/Bird tv appearance, the 2nd Norman Granz film "Improvisation" with Bird, Bean and Prez and The Sound of Jazz. It's rightfuly called " The Greatets Jazz Films Ever."
However it is possible that the Sony release will look better. They may have access to the original materials since the show was not shown live. That would suggest that CBS would have made sure that they had good film materials for later broadcast. I believe that The Sound of Jazz was broadcast live and the best extant prints are Kines. Unfortunately that may also be true of The Sound of Miles Davis-- I'm not sure what the technology was for recording multiple camera tv shows at the time. I believe it was before video tape was commonly used .