I have had the 24-105 for about 2 years now. I have never been pleased with the quality which is somewhat contradictory to what the general consensus is on this lens.
I recently just purchased the BH deal for the 24-70, and have been eagerly looking forward to this lens. Reviews have been showing this lens to resolve a great amount of detail.
At 1/200 f/4 100 i can get nearly identical results from these two lens. Now it is no where near what pro are testing with but i used tripod, multiple shots picked the sharpest from each lens, and had flash to provide pretty consistent lighting.
Does anyone have these two lens? or also make the upgrade? what are your thoughts?
I will say the color and in camera rendering on the 24-70 is amazing. i love that but worth $1800? i dont feel like its worth is at this point. To be honest i love my two other 2.8 zooms lens but i dont feel like this one stacks up the same.
after looking over the picture samples on the digital picture (http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=355&Camera=453&Sample=0&FLI=0&API=0&LensComp=787&CameraComp=453&SampleComp=0&FLIComp=0&APIComp=2
) it seems as though i am only looking at the center and the really "upgrade" of this lens will be at the edges.