I am no expert but have some (hopefully) useful experience to pass on. I work occasionally for a guy who does shop-fitting on a sub-contract basis. In the last three months I have installed around 40 of the almost latest - I say this because today we saw one one the very latest - Samsung UHDTV - Quantum Dot - displays in 65" format (other sizes available from 55" to 78") called the KS9000. When we first installed these stand-alone display units the TV itself was over £3.5k. Now they are about £2k. The equivalent LG unit OLED same size was nearly £4k. (Today).
Anyway I have therefore spent more time than is healthy in various stores nationwide of a large retailer installing these blinking things. I am amazed at the quality of the pictures - seen really up-close - compared to my "old" Sony Bravia LCD 42" telly" which is still working perfectly and cost me ITRO £3k ten or twelve years ago.
It is true that the content we use to display these units is 4k and comes from a computer within the plinth we set the units on, BUT you just want to see how clear and crisp the pictures are, and how good the colours.
Combined with the latest 4k blu-ray player (which plays existing DVD content and upscales it somewhat), a matching soundbar/subwoofer, (from Samsung, as said above, to make matching and compatability easier) and a good tv feed from a satellite dish or cable I would say they would give a near cinematic experience, both in picture and sound.
If and when my Sony LCD dies I know which way I'm heading. I am NOT employed by Samsung or the large retailer whose name I failed to mention anyway!
HTH, even if just a little bit,
Andrew