The att note recently got a ics leak. The banding issues seem to be fixed as can be seen on the xda app splash screen. They changed something so with the test image with the numbers it is a un smooth trasition from about number 7. With gingerbread you could see all the numbers. so they are changing something. It seems to create a new problem with the greys though . But it's something that I will be temporarily happy with until this is hopefully resolved.
One interesting thing I noticed was with the two Notes side by side on the previous page how one seems to be more blobbed, where the other is more defined, but has worse banding. If you look at the one that has more definition the display itself looks brighter vs. the more blobbed one is dimmer. I was able to go into a dark room and get both results. By adjusting brightness a lot higher I was able to get pretty much the right image, then by lower brightness or going back to auto I was seeing the left image. So in my mind part of the reason people are seeing such different results also depends on the screen brightness. Similar to the crosshatch/linen pattern or whatever you want to call it. When lower brightness that background becomes more apparent, but at high brightness it seems to disappear.
I set both devices on the same brightness and color mode, so thats not it.
The main difference is that the right one shows better blacks, where mine, the one on the left, is more grey, so the gradient seems more smooth when in fact its just washed out.
This is because that when the pixels are lit, the darkest color it shows is grey instead of near black.
I really hope this will be fixed soon, because I love everything else about my note and I'd hate to go back to a smaller screen.