Video quality will not be up to BD standards. It consists of 8mm and 16mm film and of standard-def TV bits, deinterlacing kills resolution even further. This says how video always trailed in quality and only with advent of HD it became more or less comparable to 16mm film.
BTW, there are two versions of the movie: 1:40 without talking heads (I believe this is the director's preferred version and mine too) and 2:40 with talking heads. Talking heads ruin the magic.