Video chain is straight from the Apple TV oto my TCL P605. The only setting on the TCL for enabling full 4K support is to switch the input mode from HDMI 1.4 to 2.0, which I have done.
After messing around with a number of other movies I'm starting to wonder if there is just something wrong with the DV transfer of Despicable Me 1 & 2. Every other movie I have tried looks really, really good, even other animated movies including Despicable Me 3. 1 & 2 are the only movies I have come across that have this over saturated look.
Here are a couple pics I took with my phone. I know, phone pics suck but, it's an okay example of what I'm seeing.
4K SDR, trust me it looks better irl:
4K DV. Looks the same if I force the ATV to HDR. Trust me, the saturation is not from the camera. It actually looks worse then the pic shows:
I figured the pink/purple image was most likely a handshake issue and after happening a few times it hasn't happened since.
The audio drops, skips are the only thing consistently happening with DV but, only at 4k/60p. Audio is fine at 4k/24p DV.
I think this will get fixed when my new monoprice cables get here on Tuesday. Despicable Me 1 & 2 are still head strachters but, so far they are the only 2 with that issue.