I've had my 4k for nearly five years. My pet peeve has been shows of lower quality artificially boosted to 4k and there are many. "You can't make a silk purse out of a sow's ear."
My TV is only 43". That's actually at the low end of where the difference between 4k and 1080p is noticeable. You never mentioned the size of yours.
[center] [hr] [poll multiple] [s] [sic] [sub]2[/sub] [sup]th[/sup] [u]
&
nbsp;

mine is 5K
My password is password

Best solution: tell your wife to go live at the store.
The Lion does not give a fuck. Bring. More. Sheep.

Yeah. My wife always gets mad because she wants the picture to look the way it does in the store, but I always calibrate the TV. I set the one in the bedroom to default settings for her.
Grade "A" Fully Loaded
"Sexy as Hell"

I know, buddy. I only reply to the ones I want to.
ᴳᵒ ᶠᵘᶜᵏ ʸᵒᵘʳˢᵉˡᶠ

You know that you don't need to reply to every single topic, mate?
You can barely afford your own sleeping bag, let alone a decent tv. Broke ass, little bitch.
Thank you for talking to me

Ok nerd lol. But seriously, I agree. They also often have the soap opera effect as the default.
ᴳᵒ ᶠᵘᶜᵏ ʸᵒᵘʳˢᵉˡᶠ

Everyone with British accents is hard for me to understand. I often rely on subtitles to know what they are saying.
The Lion does not give a fuck. Bring. More. Sheep.

There's a website that specialises in this, though I wasn't really happy with the end product on my LG OLED
https://www.rtings.com/tv/learn/how-to-calibrate-your-tv
Btw, going slightly off at a tangent, have you found some of HoTD to be inaudible? The UHD HDR showing here doesn't have subtitles, and it's frustrating. Busy scenes are difficult to discern.
Thank you for talking to me

Watched the new GOT on it and gotta say…it's filmed way to dark. Thought it was the new site…but loads of folks on line are bitching about the picture quality too.
Your settings are not correct. Default settings are never going to give you the best picture and are more geared towards watching game shows, news programs, etc. I've never seen a tv off the shelf with good brightness or backlight settings, and these generally need to be set for every input.
The Lion does not give a fuck. Bring. More. Sheep.

I bet it's killer!

I think I need to watch The Lost Boys in 4k OLED.

Yes it is…
https://www.sony.com/gh/electronics/televisions/a80j-series

Is it an OLED? Try watching the frozen planet 2 in 4k. It looks spectacular
Thank you for talking to me