http://cweb.canon.jp/bctv/lineup/multipurpose/movie.html>4 million ISO100,000 ISO looks like max usability, and is probably 1-2 stops better than the A7S. Anything close to the top-end looks like utter shit. The underwater firefly part looked pretty cool, but is really only there for the wow factor since the quality was still ass. Bar and highway scene were pretty good though, until high ISO splattered the image with grain.