The annoying part comes from sitting down and actually using the iPad, not by glancing at a bunch of photos on a forum.
This is my point: is there any real impact on daily use on a 5% variation across the screen ?
In my opinion judging the photo showed i would say no, but I didn't have a chance di look at that iPad by myself.
I don't know about my iPad, and I'm not going to do any analysis like this because I'm absolutely happy about this display. It surely is on the warm side of white balancing, but I don't consider this a bad point at all.