A good Image, not great, but it is in my view a good image, and more importantly, I learnt something from reading the method of process.
The a7r (Own & use one) is a a very good sensor matched to a mediocre system, but if you take your time on the Image (pertinent point with any Make/Model) it will produce excellent results, and having the 1Dx & 5DMK III in my view does generally produce files that have more latitude than the Canon sensors.
Having said that, I've had little trouble producing similar latitude in Images from the Canon Sensors, but it does require multiple exposures and more attention to detail.
For those that believe they can reproduce similar latitude to the Image discussed in this thread from single exposures from a Canon Sensor, I would be hugely interested to see some evidence, and I mean this in a positive sense, I would like to know just what I'm continuing to do wrong with my Canon gear that in a single exposure generally doesn't produce as much latitude as a single exposure on either the D800 (owned one of these as well) or the a7r.
In my own situation I primarily use Canon, but that's mainly because my main interest is Wildlife, long lenses. Of late I've attempted to move a little towards Still life & Landscape, and it's here that I've found a need for more latitude in the Images that the Sony Sensors appear to give, but always it's a balance, it's not always just the sensor, the system and how you use it is just as important.
Hopefully all these discussions become redundant in 2015 when Canon finally, hopefully, bring to Market a 40-50MP sensor that does have the latitude of the Sony Sensors.
I've managed to get the most DR out of my mk3 by ETTR. I mean really pushing that exposure to the right to get clean shadows. While the exmors will still be better, they aren't good enough for me to invest extra time and hassle to get one. Here is some examples.
1. Shadows or highlights? Choose high, bracket frames and pick the one that just barely doesn't clip. Process for the highlights and it's a nice clean file.
2. Well, if your doing still life, it doesn't really matter much on the camera than lighting your subject. This has massive DR that no sensor could capture in one frame. Solution = Flash or Funky HDR.