Just to get this right, the Samsung UN55KS8000 is the equivalent of the Samsung UE55KS7000 here in Europe, right? While our 8000 are 9000 in the US and our 9000 ar 9500 in the US?
Correct.
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The KS8000 in PC mode has around 45ms input lag and can do full RGB 4:4:4 with 8bit colour. To switch to 10bit colour for the PC games that support HDR, you have to drop to Chroma 4:2:0 in your GPU's control panel.
In game mode it has ~25ms input lag and again will display at Chroma 4:2:0. The setting that game consoles and UHD players etc use.
On PC I have both profiles set up, and I switch between them depending on whether I am playing a game or just doing general PC use.
Overall it's a great TV to accompany a PC.
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VS the OLED's. As a quick statement, I would say with the Sammy KS you are getting 80% of the TV for 50% of the price. The picture quality is still fantastic and the input lag is better.
I can highly recommend the KS line for anyone looking for a 4K HDR TV.