Every bit as good as expected. I also upgraded to the latest Canon 100-400 zoom, and the 16-35mm zoom with IS, and the image quality of these combos is staggering. My main uses are landscape and wildlife, and although I was getting excellent results from the 5D Mk 2, previous 100-400 and 17-40mm...
Bright LCD; Comfortable Controls; Easy To Use; Great Image Quality; Strong Construction