Angelp, thanks much for your comments. Can you give me a sense of how much better the F8000 is? I either don't have or am not sensitive to flashlighting/clouding. My main concern is consistency of picture and clarity/detail, and lack of distortion, re-focusing, mottling of picture.
In regards to the picture and clarity, I do have to say that their is a difference and one that you would notice, everywhere from watching regular cable, streaming, to blu ray. You will notice more detail in the picture, and the colors give more of a pop...of course this is just an opinion!!! Since I was able to see both sets, the detail I believe is something you will notice almost immediately. Motion is quite good as well, with auto motion plus off, or the custom setting, with led clear motion on, however the 7100 did just as good with these motion settings as well. Not sure what you meant by mottling of picture. Overall I believe the price difference is justified between the two sets, and luckily the F8000 prices finally dropped some recently. On a side note, I went to a local sears, and they had the 4K F9000 and the F8000 next to each other with the same feed...and was impressed at how similar the pic quality was, had it not been for the labels, I would not have been able to tell the difference between the two.