I don't doubt that image quality is important. But depending on what you are shooting those other things can be just as critical. The Canon cameras have fantastic image quality. A little extra DR can be nice but at other times it just isn't as important as other things. To be honest, the DR on these cameras really doesn't bother me having spent plenty of time shooting color reversal film.
For anyone who shoots action, that 4fps may not be near enough. Getting the shot at just the right time can be crucial while DR simply helps lift the shadows and protects the highlights. Fill light does the same thing. I know, fill isn't always available or practical but neither is 4fps always sufficient.
One thing I see far too often is people who complain about DR and then when they get their images, the first thing they do is go to increase the contrast. I get it. Better to have that information and discard it as you wish than to not have it to work with at all. But seriously, I think many people really put way too much emphasis on the "DR problem".
Also, ergonomics do matter. Especially if you are using your camera for long periods of time and/or have to make adjustments to your settings while you shoot.
Finally, they don't have the glass. They have an adapter which may or may not fully function properly on all lenses all the time. Even certain canon teleconverters don't work on certain lenses. Why would anyone expect such an adapter to be any different?
Don't get me wrong. I'm not saying that additional DR wouldn't be nice. But I think far too many people put way too much emphasis on it as if the current situation is somehow terrible. And on top of that, I think it's ugly. Whether you agree or not is kind of irrelevant. I just wanted to state plainly that not everyone thinks that the A7 is some magical camera that is a step above what Canon has to offer.
I am serious....and don't call me Shirley.
Canon 7D and a bunch of other stuff