I found this color correction posting by David Guva, who, "did some color correcting just to see how the [GH1 codec] AVCHD-codec handles it using Magic Bullet Colorista and Vignette."

Unfortunately, there is no identicification of what software was used for each shot. Also, no comparison of original footage to color corrected footage. Still worth a look. Thanks for sharing David.

http://www.vimeo.com/5550518