The review of "Don't eat anything with a face" answers some of your questions.
Subject: "Forks Over Knives"
Pretty interesting but I don't think the Dr's considered permaculture raised meat. They just say meat is bad basically. They didn't qualify the quality of the meat that was being consumed by the people in the studies.
It is on Netflix Instant.
Would love to hear a review about the movie in a podcast or at least by some other people.