One of the biggest complaints of the 5D mkii was the low ISO banding in shadows, this effectively reduced the usable dynamic range severely and ruined allot of pictures as the noise/banding just didn’t look natural like random noise ‘can’.
Note this banding was still happening at higher ISO’s as well, but was somewhat disguised by the amount of random noise that was also in the image.
So, as that this was one area that many 5D users have been screaming about for so long, why on earth has Canon not fixed this issue?
From a sample that has been posted on DPR, you can clearly see that the banding pattern is still there, however instead or a tartan pattern, it appears worse as the noise now looks like it’s in some kind of pinstripe, like you get if your print head has a blockage. This is a big problem as it looks very unnatural so the viewer knows it doesn’t belong in the scene!