If color and contrast is your big worry, you should look at a plasma flatscreen instead of a LED.
A litte more electricity use, but has darker blacks.
we were looking at oleds- well, wishing really- they do look nice- but the whole burn in issue- but i guess they have soem now with ‘guarantee’ about burn in not being a problem for a number f years- so that might have changed-
We’ll check he plasma, hadn’t looked at those in years- that might be an option too- thanks