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We always hear about the d800 sensor is amazing for shadow recovery, but can anyone post some images that show the real world use and why the 5dIII is not good enough?
Yes. Well, not from a 5DIII, but a 5DII (which has the same dynamic range):
(I've posted this a few times previously when the same question has been asked, so I won't go into extensive details here again.)
Here is another example from a recent photoshoot of a newly constructed prison:
As you can see, there is a huge skylight flooding the common area of the cell block with light. The dark gray cell doors along the catwalk, however, are not illuminated and come out way too dark in the original photo. Setting up extra lighting on each door is not an option. When processing the photo, the simplest thing to try is lifting the shadows, but that leads to very evident shadow banding on the doors. The eventual solution is a combination of blending multiple exposures and masked noise reduction. So in this case, yes, it is quite plain that an EXMOR sensor could have handled this scenario much better than the Canon sensor.
On average, I'd say I run into a circumstance at least once every photoshoot where the dynamic range is an issue and I either have to set up extra lighting on site, or I have to do extra post processing work on the computer. (Why don't I use a D800, you might ask? Because Canon's TS-E lenses are more important to me.)
The thing I keep trying to explain is this: scenarios where dynamic range becomes a real issue with Canon are rare, and when they occur, there is usually a workaround. But: that doesn't mean I don't want a better sensor. Because it would be a nice benefit to my time and productivity if I could simplify my shooting and processing and not worry about workarounds.