If you're going to compare, you have to be fair:
* Nearly 1 stop better ISO (that puts it level with the d3s and virtually at the new d4, so it would seem)
The only thing that **hasn't** changed much is the amount of MP and DR!
The ISO improvement appears to only be with in-camera JPEG output.
That means that there is non improvement in the sensor itself and thus no improvement for people that shoot raw.
Thus, with the exception of fixing the banding problem with the 5DII, there has effectively been no improvement in the sensor from the 5DII to the 5DIII. Thus there is little to no improvement in image quality for anyone that uses the 5DII today to shoot raw.