I've just posted on this, but feel compelled to post some more. I'm watching the Sky sports French GP coverage on an LG OLED 65B8PLA that's 6 months old. I'm watching via NOW TV on an apple TV box. Picture quality is stonking.
I've just installed the NOW TV app on my LG....picture is terrible quality, and every now and again it gets worse and very pixellated. So I made a wired connection between tv and router (apple TV is just wireless), absolutely no change. Apple tv feed remains pin sharp all the time, LG TV app never gets close to the apple tv quality, and pixellates often. It's not the network, it's not the TV. It's got to be the LG TV NOW TV app. Feel free to grill me further if you like :))