I can't figure out which one I want to buy. I keep going back and forward. I have a tamron 28-75 2.8 and I also need a telephoto. I rented a 70-200 2.8 IS II, but I know its no way I can't pay 2k + for a lens. The wife is letting me buy a mark I verson or the 24-70 2.8. People keep saying in all the post the image quality are very close and its not worth paying 900ish more for the canon. In the back of my mind something is saying go for the canon 70-200 2.8 IS, but another part of my mind is saying the 24-70 2.8. I ask this in the lens forum also. Yesterday after I did the wedding I really enjoyed using the 70-200 even tho is was to long for anything but the church shots.

