I'm all set up for 4K. Watched Wonder Woman recently and there was no way it was 4K. 1080p at best. I couldn't really check it, because my TV says the signal coming from the ATV4K is always at 4K res. So even if I'm watching Netflix, my TV says it is getting a 4K signal because that is what ATV pushes thru every time, regardless of content.
It looks like a bit of a scam to me and I can see why people stick with the hard discs.
It takes some work but you can easily see if what you are watching is 4k.
First, make sure you have the content match setting set to on.
This way, the Apple TV won't flag HDR on a non HDR movie.
Start playing the movie, once it is playing, swipe down on your remote.
In the film info, if it doesn't mention 4k, it isn't
Also, use whatever method you have to see if HDR is flagged on your TV.
Eddy Cue worked very hard to make it as confusing as possible.
Let's make them think they own everything in 4k! They won't know the difference!
You just have to remember, if you bought it on the iTunes store , used iTunes to redeem the code, or used a code from a UHD Blu-Ray, then you get the 4k version.
Just last night, the Dark Knight Trilogy and Inception showed up under my 4k/HDR Library but of course they only played the HD version.
Thanks Eddy!