I know everybody has invested in lenses and accessories, so jumping ship is not practical, but here is what that 3 stop of extra DR can mean (5D3 on top, D800 on the bottom):
All this really proves that even two of the best cameras currently made are each capable of producing suboptimal images when used incorrectly.
It isn't that the 5D III was used incorrectly. Fred Miranda was the one who did that review, and he is a respectable authority on such matters. The original sample images were shot to keep the whites from blowing in a high DR scene...and this, quite plain and simply, is indeed the result when you lift the shadows to compensate. There isn't any question that Canon has issues with their low ISO DR. It has been blotchy and banded for well over five years now, and it is Canon's weakest point.
Given DXO's review of the 70D, it's clear they have not put any effort into improving sensor IQ. Canon's focus is clearly different, and the weight of their focus has clearly shifted heavily towards video. I was hoping to see a better DR improvement for the 70D, and these results are rather disheartening. I'm a stills photographer, and I use my DSLR for still photographs. Quite frankly, I would really like to see Canon invest some of their huge cash flow into improving their products for their primary intended purpose, and not some secondary "sometimes convenient" purpose like video.
The Magic Lantern crew proved that Canon's sensors are capable of capturing the full 14 stops of dynamic range allowed by a 14-bit ADC...I think its high time Canon stopped their focus in video and returned their focus to EVERY aspect of IQ, including factors based on the sensor. I've argued in the past that there are other factors that affect IQ, such as AF system, but Canon has already perfected those technologies. Fred Miranda's comparison of the 5DIII and D800 is an excellent demonstration of why Canon should finally shift their focus back towards improving still photography IQ. I don't even think the problem is in the sensor, either...I think its in the ADC...and Canon pretty much whips up a new version of that every major release cycle anyway...so there shouldn't be any reason they couldn't invest some serious R&D into solving their low ISO IQ problem.
No more clever arguments from me about why Canon's products are good. They are, but that isn't the point any longer. I truly hope to see something significant on the sensor/ADC IQ front with the 7D II...otherwise, the 5D III will probably be my last Canon DSLR purchase until they stop focusing on secondary video functionality and refocus on the primary purpose of a DSLR: photography.