This is brand new Canon 5D Mark III. There's green light banding when taking photo or video in the environment with fluorescent light. The first Canon 5D Mark III was returned to the shop. And this is the second one. But it still has the same problem.
So, I think this is a general issue with fluorescent light. I recorded a video clip of this problem here http://www.youtube.com/watch?v=MOer6WPnPDM
There is also a yellow banding here http://www.learningdslrvideo.com/yellow-banding-high-iso/
Is there any way to fix this problem? Should the Canon release anything to fix it?