Hi bought a 55Q8600 on takealot and the panel was absolutely amazing. Dolby vision is beyond brilliant! But I returned it after 20 days because of the motion issues. I couldn't stand the stuttering every so often.
From my use, I think it only handled Dolby Vision Netflix content smoothly.
I used the apps on the unit DSTV Now, Prime Video (Only got HDR), Netflix (Dolby Vision)
I used a FireTV gen 2 that has 4K available.
PC with windows 4K@60hz + HDR. Couldn't really find a game for it, ended up playing some Witcher 3 at 1080p, it felt great.
Everything juddered and bounced up and down constantly giving me headaches. (Smoothing OFF)
The smoothing features didn't help either, it stays smooth for a few seconds and then I get a frameskip or a face blending together into a thin line.
Peoples hands irritated me the most when someone moves there hands while talking it looked as though it was a streak of light moving and not arm and hands individually.
I returned the unit and just now received the 55U7WF.
My dreaded motion issues feel resolved, with all the smoothing off I can see clearly and it feels "normal".
I can concur that there is black crush it does NOT go as bright as the Q8600 and HDR and Dolby Vision is not really Wow as it was with the Q8600.
I'm not really happy yet with my purchase.
Does anyone else have the crazy motion problems I experienced? I'm tempted to try the lottery again with the Q8600

I'm not even sure if the motion is a per panel thing. And how do I go back to mediocre colour after it.