I've been playing around with a few pre-production raw files in ACR. As a professional photo retoucher this is my area of expertise. I realize that the latest version of ACR is in beta and pre-production bodies aren't a good representation, but at 100, 200, and 50 ISO I'm noticing some profoundly terrible results which are noticably worse than the 5D Mk. II.
It just looks like there is way too much noise at low iso, the images look like they were taken with a 5 year old point and shoot camera at base iso, not the latest pro body. Specifically, at iso 100 I'm finding images look like the 5D Mk II at iso 800. I've seen this in two pre-production bodies so far and am becoming very concerned about the 5D Mk. III image quality.
So if you guys could post your 5D Mark III low iso raws, I'd appreciate it, thanks!