Well it has been a while since I posted and after reading this thread I thought I was on the Dpreview website, I had to check the status bar just to make sure I was not. Without an actual production camera and raw data the discussion here can be compared to arguing about how many spirits can dance on the head of a pin. Most of the discussion focuses on lack of DR in Canon sensors, this is what I have learned, DR changes with ISO and lenses, so do not expect the same DR across all lenses and ISO range. I use a Sekonic L758 DR light meter and I exposure profiled my camera and lenses, a very lengthy process, and yes there is a slight change with different lenses. My 5D MkIII with the 24-70 f2.8 has a rage of +3 to -5 EV from ISO 320 to 2500 and 2.5 to 4.6 at ISO 5000. For the more knowledgeable readers they will have figured out that I pull my ISO and they may also know that Canon sensors perform their best with pulled ISO. To get the most out of my sensor I set my ISO 2 button on the light meter for filter compensation and a setting of +2.3 for a safety margin in preserving highlights; I read the brightest part of the scene, press my ISO 2 button and the light meter gives me the best exposure setting for the sensor and lens, for both stills and video. This works for 95% of the shots, for the other 5%, the in camera raw blending (HDR) does more than an adequate job and there is always post processing. I try to reproduce the image my eyes sent to my brain, I let nature do the cooking not my software and since I do not overcook my pictures in post processing the 5D MKIII has not let me down. If I am unhappy with a shot or it does not turn out the way I saw it, the failing is mine not the cameras and certainly not the DR of the sensor, good photographs are about composition and light not about megapixels and DR.