I first saw 'A Touch of Zen' in the late 70s; it had such an effect on me that I looked for it on video for years and years, but to no avail - then to my relief it was shown on TV during a martial arts night twenty years later. In fact it was shown as the finale of that night - so perhaps I am not the only person who thinks this is the ultimate martial arts film.
It is over three hours long; the first hour is mainly scene-setting and not much happens, but this just adds to the impact. All you could want in a film is here - tension, action, arty filmwork, a kind of love interest, action, beautifully choreographed fights, intrigue, action, comedy, philosophy.... and a monk who is so pure that when he is wounded he bleeds.... well, you'd better see for yourself what he bleeds.
A must-see (if you have three hours to spare).