Great work, Tim! The 5DIII handles great and is a pleasure to use. IMHO, this is one of the most important elements of a camera when shooting, but unfortunately this seems to get lost in all the squabbling about DR.
Thanks man! BTW I love your work.
I really don't understand how the DR is lacking. If I want to bump up the fill light to 100 I can, and its usable.
I never even noticed any banding on my MK2.
Oh, and with the 70-200 2.8 is in bright day light, focus is literally instantaneous. It focuses in the time it takes me to push the button all the way down.
Thanks!
I stepped up from a 5DC to a 5DIII, so for me there has been a nice improvement in DR. The instances where I need more DR than this camera can offer will be few and far between, and of course there will be measures in the field I can take to work within these limitations.
The more I shoot with this thing, the more I like it. Everything form the reduced shutter lag to the lightning fast AF to the sound of the shutter itself makes it feel like a more substantial camera. My gut reaction to the C1/C2/C3 settings on the the dial was that they were a gimmick, but I'm finding them quite useful.
I was shooting cars on a track a few weeks back with a 1DII, and was waiting to get some shots of one car in particular coming around a corner. During the downtime, I shot statics of the crowd, parked cars, people working on their cars, etc. When the car I was waiting for finally got on track, I had to switch from single shot to high speed continuous shooting, flip the AF from one shot to AI Servo, change from full manual to shutter speed priority, adjust the ISO, and lock in the shutter speed where I wanted it in a matter of seconds. That's a lot of menus to flip through on a 1D, which increases the potential of missing a shot. On the other hand, the ability to change everything at the flip of a dial on the 5DIII is awesome. It's something that will never show up on a lab test, but I'm sure many shooters will appreciate the added user friendliness.
Great point. I've actually never used the C1 2 and 3 dials. Doing weddings, I've never really had a need to do too many changing of settings like that real fast.
As for the improved shutter response, I have to get used to that! I think the button is more sensitive. On more than one occasion i've just wanted to lock focus and i accidentally took a photo. Not saying its bad, it just takes some adjusting. Just like the different location for the zoom button. It took me a while of playing with the camera to get used to it. I'm finally hitting the right button to zoom, and now when i pick up my 5d2, i keep hitting the wrong thing!! I've gotten too used to the new camera! Just cant win!! 
You might want to try programing the "set" button to zoom to focus point, works great. The left side of the camera is hard to get buttons right by feel, i seem to hit the rate button alot. I just set mine that way. For weddings i have C2 set for receptions with Manual with flash among other things. C3 set to receptions no flash, meaning Manual with huge apertures of 1.8 to start and auto iso as well as other features.C1 set to Aperture Priority and other functions. This will be quite useful. Hopefully we can program how we want our flash to operate in custom functions some day with a firmware update.