have you actually used it or just looking at internet waffle?
This camera is awesome period.
I feel like a veil has been lifted going from the 5D2 to this
I was never unhappy with the IQ from the mk2
The funny thing is that while the tech heads and pixel peepers are going poo poo over the spec sheets and 100% crops, I find myself blown away by the overall IQ of the 5DIII's files. For lack of a better phrase, I find the image quality f***ing stunning. The color, contrast, and sharpness have that film-like quality the 5-series bodies are known for, and now the MKIII matches that up with pro-grade AF and build quality, 6 FPS, and dual card slots. I will put every single one of those features to good use on every single shoot. However, I will never hear back from a client complaining about how they weren't impressed by what they saw when they pixel-peeped my images at 100%.
I understand that judging a camera merely by the "wow factor" of its images is far too subjective for tech heads, but that's fine by me because photography is a subjective medium. I also concede that the D800 seems to top the 5DIII in many technical benchmarks at a lower price, but that's OK too, because its advantages aren't enough to make me a better photographer.
IMHO, the 5DII was a smashing success not because of how well it performed in a lab, but rather due to the stunning quality of its images. The 5DII's files had a certain "look" that was immensely appealing to pros and hobbyists alike, and based on early user feedback, the 5DIII will continue that tradition. If this is what Canon can accomplish with a $h!tty sensor, I'm not complaining