Santa gave me a new TV this year, a Sony Bravia KD55XE9005
It's pretty, but let's quibble!
The control system is labyrinthine. The most used bits are in an "Action Menu", the rest is buried at the bottom of the Android Home page that has the Netflix/Amazon pay us $$$ links I don't use.
The best advice for Video settings is to leave them alone unless there is an obvious problem - and I've not noticed any.
The computer's graphics card is willing to display 2160p but with my present three screen setup (!!) runs hotter if it does, more so with games. EVE would be unplayable anyway due to tiny text, a known problem.
Setting up the computer for HDR has to be done at both ends to work properly. Windows 10 will tell you if everything will work.
The previous TV couldn't cope with 1080p, no problem with this one. 4K is presently only broadcast by subscription. There is plenty of it on YouTube, including some wildlife and travel channels.
The Humax Satbox and Sony disk player link in OK. The TV comes with an "IR Blaster" that ingeniously attaches to devices and replaces their remote controls to some extent. I have it attached to the Satellite box so the TV's programme guide can operate it.
Mirroring from tablet to big screen is easy - one button.
Tablet remote control app? Fine!