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24-70mm F/2.8 L is a very sharp lens .However,I found most of the time not wide enough for landscape work.
Canon 5DMark III + Canon 24-70mm F/2.8 L for landscape work
Added two more (5DIII + 135L F2):
Is there any place where we can get 5d mk iii sample Raw files so we can play around how much detail we can recover from the shadows. And is the ISO level in 5d mk iii superior at 6400 compared let's say d600 or d800? I was trying the raw files from dpreview but some thing from a more natural setting (environment, landscape, outdoor or indoor portrait) would give help clear out how much we can recover without creating those nasty bandings and noise.You do not create banding and noise, it is just there, and if you boost the exposure enough, you will see it. It seldom shows in a print, only when you look at the image at 1:1.
The issue with obtaining raw images is that every image is different, so its easy to manipluate the results by selecting one that shows whatever you want. Then you make a general statement about how wonderful or how awful it is.
As you raise the ISO, the DR and the ability to recover shadows lessens. The D800, for example is supurb at ISO 100, but at 12800, the 5D MK III is better. However, at very high ISO settings, neither will tolerate a poorly exposed shot, it must be right-on. Forget about pulling up shadows at ISO 12800.