So, you want the perfect TV? You might be just as happy sticking with the one you have. In this video, I share six reasons that even 4K OLED TVs aren't yet perfect.
#6 Upgrading from 1080p to 4K OLED is expensive, 1500 USD and up for a current model.
#5 OLED screens are subject to burn-in, where the pixels in certain areas of the screen wear out and may be permanently dimmer than their neighbors (see videos online about this including the latest "rTings" evaluation.
#4 While 4K UHD content (especially disks) can look better than 1080p FHD (bluray) content, you will need very, very good viewing conditions to notice much difference, especially since much 4K content is simply upscaled from 1080p. To see the improved quality, plan to sit about the same distance from the screen at the width of the TV.
#3 Due to OLED screens showing each frame of a film for 1/24th of a second, motion will appear to "stutter". This is due to each frame being RECORDED for typically 1/48th of a second, with the next 1/48th of a second NOT being recorded on film/digital. Extending each 1/48 recorded frame to 1/24th of a second introduced "stutter".
#2 OLED TV's, such as the 2018 LG C8 feature "motion interpolation" which will create intermediate frames between each of the 24 frames per second in film content, which creates a very smooth "soap opera" effect. The downside is that fast motion and action scenes, especially with many objects moving in different directions (and turning) are impossible to properly calculate, leading to digital artifacts / blurr / pixilation. The more frames that are interpolated between the 24 actual frames, the greater the pixilation.
#1 In a cinema, each frame is displayed for half of the 1/24 of a second, by displaying the frame for 1/144th, then a "black frame" for 1/144, and repeating that three times. On OLED TV's with real 60 Hz or 120 Hz refresh rates, inserting black frames can improve the motion, but will introduce "judder". This is due to a 3 to 2 ratio between the even and odd number frames, or the requirement to add an interpolated frame 2-1-2.
OLED is not yet perfect, and 4K might not be worth it, but perhaps it is the best that is available at the moment. If you go in with your eyes open before the purchase, perhaps your expectations will better match reality.. :-)