KM 7D, just because

Ahhhhh, getting her done indeed! Just look at those beautiful colors.

This combo was one I wanted to employ too, but had issues with a borrowed 10-20 on my 7D. It was the 4-5.6 version and the focus was very intermittent for me. One time it was in focus and the very next shot everything was very oof. It kept wanting to focus out to the infinity mark no matter the distance of my subject. I ended up shooting via hyperfocal distance and then it looked great. Which version (4-5.6 or 3.5) is yours?
Regards, Jim