Also, you don't have bleed in the corners. Bleed is when part of the light is shining through the actual panel edges. What you have is viewing angle deficiencies, which IPS panels have. Sit right in front of that "bleed" and you'll see it disappear completely. If it were bleed, it wouldn't disappear.
Agreed, I think people are looking for things that are wrong with your newly purchased iMac's. If you only use it like you have been in the past and then if you notice something fine, then complain to someone about it. But don't go to extremes to find stuff wrong, the problem is, if you look hard enough you will find something small wrong. Question that you have to ask yourself is this: