I have a 5dc and a 1 D Mark iii for sports, and 40d. Looking to buy a 24-70 2.8 or the 5d markii and still use my 24-105. My original goal was to start up grading my L glass to at least 2.8 zooms. now think the 5dmarkii could get my iso high enough for more natural light shots and start playing with video......same price.....Anyone use then24-70 2.8 on a 40d for sports? I know the 24-70 is used or was used a lot on the 5dc. Thoughts or suggestions? Other links?