I got one but I have asked them to deliver this tv when I move to my next house 8th of august so I can't test it yet. I also can't seem to find anything on google.
I'm asking for games not enhanced by pro like a gta 5.
the tv I got is a samsung qe49q6f 2018.
another question: do I need a special hdmi cable as well, or will just any cable do, like the ones I have?
Better compared to what ? Compared to older things they will have enhanced aspects in some areas.
OLED will deliver contrast that matches and exceeds that of a CRT and is free of motion blur. There's the burn in factor however, and worse than plasma screens have.
QLED is only a backlight technology for LCD, you will still have inferior contrast, motion blur and other factors that cannot be fixed due to screen itself being LCD panel. Color rendition will be better compared to earlier LCD things but won't be as good as OLED stuff for example.
Any TV will be subject to latency from the image processing they do, sometimes there's a game mode that reduces the latency. There's no difference in things like sharpness. Both types can be very bright (but it does reduce their life time and in case of OLED speeds up burn in process).
4k might need a better HDMI cable, if you see snow or other artifacts you will need to get one that is explicitly guaranteed to support HDMI 2.0 or newer, then you'll not get problems.
I mean compared to an older led 1080p screen. will it also upscale 1080p or lower stuff to 4k?
I know the difference between oled and qled but I looked at them side by side and I much prefer the brightness of qled then some dark contrasts in oled.
That's highly TV dependent and has nothing to do with OLED, QLED or whatever else. All completely dependent on the image processor. Some TVs may have blurrier result than others when displaying non native resolutions. 4k is exact multiple of 1080p so the results cannot be that bad but isn't going to look as sharp as on a native 1080p screen simply due to need to scale (and there's never any integer scaling option that just doubles pixels).
yes but oled and qled supposedly have better contracts in colors. will this also apply to older games on a ps4 for instance? will I see better contracts on a gta 5 on ps4?