7D and Greenscreen

I've been finding some positive results with the 7D and keying. It seems the way it's codec will smooth together common areas of color or chroma can make for a pretty easy key to pull. Here's a quick shot though where the 7D can really burn you. Its not so much in the greenscreen where I'm having an issue, its in the blocking in the pants. That's an ugly mess. This would have been a problem whether on greenscreen or not and points to the DSLR's codec needing more detail rather than less. It looks like I ran the cartoon filter over it in After Effects. Something to consider when you're shooting.