One thing that I have learned is that there are a lot of TV manufacturers touting the 4K logo. There are some cheap 4K TV's out there, but they use an 8-bit panel. The more expensive 4K TV's use HDR10 which is a 10-bit panel. It is best to read very carefully if you plan to buy a 4K TV. For example, Hisense has a 50" 4K TV that claims it has HDR. However, it is actually an 8-bit panel that simulates 10 bit. To make matters worse, the Hisense could only display 4K via USB. There was an update here recently that now allows 4K content via HDMI 2.0 that is said to be HDCP 2.2 compliant. Dolby Vision is the BIG new thing using 12-bit panels. Just goes to show you that at the end of the day we get what we pay for. That is NOT always the case, but it is more often than not.
Cheers,
Phil