While at the Canon Expo 2010, I was able to take a few shots with a pre-production Canon 8-15mm f/4 L Fisheye on a Canon 5D Mark II. (I was not allowed to test this lens on my Canon 7D.) All images were hand-held.
Related Articles on Canon Expo 2010:
Canon Expo 2010 – New Products
Canon Expo 2010 – Future Concepts
Canon 8-15mm f/4 L Fisheye – Sample photos
Canon 400mm f/2.8 L IS II – Sample photos