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My 5DIII was new two weeks ago.
Very happy so far. Like the colors better than with my 5D II (shooting "faithful," as I did with the 5D II). Haven't tested this yet, but subjective impression is that the metering is improved.
Also, more shots seem to fill the histogram than with the 5D II. Have to do a side-by-side to confirm that. If it is happening, that alone would make the 5D III the better landscape camera. Problem is, I can understand how a lens with better contrast would do that. Not so sure I understand how a camera makes that happen. So maybe it's just my (happy) imagination.
Another landscape advantage is less noisy ISO 400. Hints of shadow noise that don't matter at all for most work can be a major pain when you are making big prints. Big edge to the 5D III there, I think. Still experimenting on that one, though. Enough success so far to make me start wondering about ISO 800, which I would never touch for landscape with the 5D II. Now have to find out.
I also like the touch on the shutter release better, like the quiet shutter mode, and have had excellent success using the focus confirmation in the viewfinder with MF lenses (after applying a bit of MA to some of them). My Zeiss 35mm f/1.4 is turning out one perfectly sharp shot after another, wide open, when I use the center column points and rely on focus confirm. I find that mind boggling.
With AF, you can set up the camera to just show the cross type AF points, which are the better ones. The points nearest the frame corners are not quite as reliable as the ones in the middle (maybe a function of declining lens MTF values toward the edge of the frame), but all of them seem to do at least as well as the center point on the 5D II. In general, the corner-most points seem to approach 100% reliability for shots at f/2.8 or smaller. Even at f-stops faster than f/2.0, I have been getting mostly good results from the outer points. With my 5D II there were always more than a few images from any autofocus shoot that were culled for bad focus, and that was using only the center point. Very few of those with 5D III, even with low light, and using all the points. Some fast autofocus lenses that I had been reluctant to use wide open on the 5D II became instant reliable performers at max aperture on the 5D III—notably the 35 L and 85 f/1.8.
Not sure yet whether the 5D III will turn out to have any live view focusing advantages. That was working nearly perfectly for me on the 5D II, so maybe not much room for improvement there. Have to buckle down and get that sorted out next.
And of course for moving subjects it's a whole new world.
I had planned to stick with my 5D II, then didn't because one smaller part of my landscape work really needs autofocus, and now I'm glad. It's a better camera in more ways than I expected.
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