You may want to take a look at the RTINGS reviews of OLED TVs and what they say about watching sports on these sets. Yeah obviously a panel with 0.00001ms pixel response time is bad for sports and games. Yup.
And i hope you're not saying that the KS8000 is better than the C6 based on what you saw in a store. Even the EG9100 looks better than that set, because as good as it is for a LED it's still a LED, so unless you really enjoy those greyish blacks, halos, clouding and motion blur...
Also, you say that OLED isn't quite there yet (i can agree on the fact that it's improving every year and it will still improve because the tech is fairly new) and people should hold off on buying one of those, so i'd like to know what you think about the fact that Samsung already showed an improved HDR that makes the current one look like crap and will be featured in next year's TVs, because it isn't compatible with the current HDMI standard. Maybe people should hold off on buying 2015-16 LEDs too then, especially considering that unlike OLED TVs, they don't even support Dolby Digital.
Every tv is prone to IR, LED are generally less affected but it's a non-issue on OLEDs as well. I had a bit of IR after watching a game of Euro 2016 because the national TV has this fucking huge blue banner with the result on it, but even after two hours of displaying that shit it was absolutely non existent with normal TV usage. I had to pop in a test image on purpose, out of curiosity, to (barely) notice it was there and it disappeared after like 30 minutes anyway. 32ms input lag is plenty good for every gamer that doesn't play competitive Street Fighter and many of those people use old CRTs to avoid input lag, because LED with 20-25 ms still have 1-2 frames delay. Normal people that play normal games won't even notice the difference.