I bought a 40" 4K Panasonic the other day on eBay which I used as a PC monitor. It was an upgrade from a 27" 1080p monitor. I usually download what I want to watch (usually TV shows) and haven't watched broadcasted TV for over 10 years due to annoying ads. I choose downloads around 2 to 3 GB and find the picture quality watchable. I've never owned a Blu-ray player. Recently I won a brand new Philips 55PUT6400/12 for cheap on eBay (like £1.20 cheap) and bought a Samsung UHD player to watch some UHD movies. I sold the 40" before buying the Samsung player. I was expecting the movies to be as sharp as that 4K Sony 'Another World' demo you see in retail shops, but they looked the same as the 2GB downloads I've been watching. The TV only has a few picture settings. The 'Movie' setting has strong anti-aliasing that makes viewing Windows 10 correct, but I found the UHD Blu-ray films to be similar to 1080p downloads on this setting. The UHD discs are supposed to be about 90GB right? The other settings make UHD Blu-ray movies oversaturated and pixelated. The last show I downloaded was Fear the Walking Dead which was 2.4GB and was the same quality of a UHD Blu-ray movie disc. I can't play the Sony 'Another World' demo smoothly on my PC as I have a potato processor atm, but what did play was very sharp like I saw in retail shops. It might just be that the TV is 55" and a smaller 4K screen would be sharper. I which I could screen grab a movie shot to show you what I mean. I've read numerous bad reviews about Philips 4K displays so maybe it's just that. If it isn't then I want 8K movies.