The set is not defective, it is the tech that is in the set that is defective. I have owned two Kuro's and two other Panny plasmas and this is the worse of all four monitors. In order to obtain bragging rights to get the blacks, everything else was sacrificed: motion handling, sharpness, brightness, and imho overall PQ. It is also not a calibration issue, since I have been tweaking the gray scale every few days with my i1Pro.
For whatever reason, it just does not look like a plasma. The best way I could describe the picture is looking at a broken LCD. It could be that after five years of looking at the best monitor ever made I got very used to the image and nothing will ever compare. Unfortunately, I have to wait two weeks for MHT to exchange it with the Sammy. I hope this is better or I guess it is time to start looking for a used Kuro.