A:Answer I saw both of these side by side, the 800 is night and day in regards to colors and outright Picture Quality. I bought the 800, and am very satisfied. Make sure you purchase a new HDMI cable that can handle 4k. I had an older cable and the PQ was terrible here at the house, looked like the 720. A new inexpensive, $13.00 HDMI cable solved the issue. The 800 is gorgeous, and for the money, well worth it. And no idea on the 60", but I did see a 60" 900, and it was just as good as the 800. Kicking myself for not buying the larger set, but the $799 price on the 800 was to good to pass up.
