I've had this set (65ks8000) for about a week now. I'm running the rtings settings and the PQ for streaming, bluray, and ps4 (on game mode) have all been outstanding. I don't seem to have any light bleeding or any other common issues (fa01 panel, 6xx serial number). However, I have been really disappointed with directtv PQ. I'm starting to think this has something to do with my setup as directtv looks great on the panny plasma this was replacing and the 60" sony led I have in another room. I'm running the 8000 on one of the c61 wireless boxes. All resolution formats are checked, and today I switched it to Native which seems to have helped quite a bit, but still not perfect. The issue is that the picture seems grainy, somewhat washed out, and blurry (especially faces). Also, as I was watching The Open this morning I received a notification from the tv along the top with the message "The current input resolution is low. Please check the resolution of the source device". It went away after 30 seconds or so. I've adjusted every setting I can find. The auto clean view cleans up some of the noise, but it results in a loss of detail, and doesn't really help the washed out look.
Do I need the newer c61k boxes to get better quality? Does this need to be hooked to the main hr44 (or do I need to upgrade to hr54)? Is there some setting on the current directtv box I'm missing?
FYI, I have read the first 70 pages of this thread, so I apologize if the answer lies somewhere between here and there. You all have provided a great deal of information that have helped me quite a bit so far.