I’m going to post my experience for anyone who has an LG C7 OLED. In short, I was extremely frustrated upon the first few days of use with my Apple TV 4K. From the “HDR Everything” to the lack of granular audio controls, I felt like I had downgraded from my Apple TV 4th gen. HOWEVER, after doing some extensive fiddling with settings, I am now pretty overjoyed with the box.
For those who have the LG C7, head over to rtings.com. I followed most of their settings, including the important note on setting Dynamic Contrast to Low. This activates a tone mapping function in the TV and I have noticed that it dramatically improves the HDR/D-Vision content.
But for the biggest improvement (and this has been covered by other helpful posters in other threads) - you must ensure that the Quick Start option is set to ON in your iTunes app settings. At first, I disabled it as the description makes one believe that you’d get better quality by turning it off as it would only play the highest quality at the expense of some buffering time. NOTE that I have 300Mbps internet, so speed isn’t an issue.... With Quick Start OFF, I rented a certified D-Vision 4K film from the iTunes Store - Kong: Skull Island. It looked pretty bad and then I noticed that it was just labeled as “HD” in the drop-down menu. After reading more into the Quick Start setting (and then also, at the same time, changing to the rtings.com settings for the TV), I turned on Quick Start, restarted the movie and WOW. Seriously - I have never seen such amazing picture on a home television. The HDR was bright, looked amazing, blacks were inky, colors were rich and full, and I just sat there for two hours in awe. (AND - I was pretty much expecting a crappy movie, but was pleasantly surprised. If you want to just have two hours of fun, monster-movie action wtih some great special effects, definitely watch this movie.)
Turns out that turning ON the Quick Start setting is telling the Apple TV that your internet is fast enough for 4K (they need to update the settings description for the feature as it’s very misleading). Now, my 300Mbps is bringing in stellar 4K rentals from iTunes, consistently.
Now, this doesn’t solve the problem of the “HDR Everything” as the non-native HDR content will still look over-processed, but I’ve read that Apple is working to better preserve the original non-HDR content in future updates.
So, I know that everyone has different experiences, settings, viewing scenarios, etc. But I hope this is helpful to those of you with a C7 who may need to tweak just a few things.
EDIT: Just adding a note that the Quick Start only impacts 4K HDR movies that are streamed from iTunes. It won’t affect other apps like Netflix or content that is streamed from your home network. But since 99% of my 4K HDR movie watching will be rentals from iTunes, this works for me. YMMV.