Hey Banik, really don't do this to yourself.
I think you are coming from the Plasma v20D.
Really give the Oled's a second chance, you will really find the LED,LCD very flat compared to teh Oleds. If thats the right term I might use.
I was quite happy with the Sony x90F in the store demo, but once I got home and played the same 4k content on my plasma, in a dark room,
There was no comparison, even the 1080p Plasma looked better than the 4k x900f. Just something about true blacks that can't be ignored in a bedroom.
Whereas, for Qled, I found them over saturated...like I have turned up the Digital Vibrance all the way up on a PC, just totally un-natural.
These are just my thoughts anyway,...I generally watch in a dark room, so I am biased towards deeper blacks than just nits.
Also, most of the content we are generally be watching will be HD or SD, even Netflix movies in 4k are just a few, so the Up scaling of the TV is important to me, and this is where I would stick to Sony though the LG's alpha9 is as good.
You will be spending alot of money, do a test with the content you will be watching and if possible go to the dedicated BRAND store after dark, they should agree to turn the lights down if you insist so you can demo them.
Just my thoughts,
Cheers.