I have a 2019 iMac 5K Retina and it has this problem after less than two years of owning the machine. I spent nearly £3000 on what I thought was a cutting edge display, and have been otherwise very happy with the machine. I then realise it has this clouding in both bottom corners, which is easily visible when displaying all one colour, like a plain white window in any browser. A real shame that the very latest model of this iMac still has this issue, and the issue hasn't been corrected after all this time. They clearly have known about it, and yet the model is still being sold with this fault. They should add 5K DISPLAY CLOUDS OVER WITH IMMOVABLE DUST DESIGN FLAW to the list of features on the advert on their website. Utterly let down. I do not have AppleCare but it is just less than two years since I purchased it and have been told over the phone by Apple tech support that the UK has two years statutory consumer rights on any purchase. I hope that Apple Store will at least repair the display for free, as this is their design flaw, no fault of my own. What is the point in a 5K Display if you effectively get clouding across hundreds of pixels. If these were dead pixels in an LCD display, you would get a replacement from the manufacturer. This is a terrible design flaw that should be flagged up and accounted for by Apple. I mean you think you're paying extra for quality design???