This video (from Ben Miller) is shot in 4K and gives a real sense of the clarity of iPhone 11 Pro video, and the real world problem of trying to share that video.

I’ve seen the original, raw footage of the video, and the same video posted on YouTube. YouTube compresses the original 4K footage enough that you can easily see the difference. Add to that the fact that you can’t watch 4K YouTube footage in Safari (it’s a codec licensing issue), but even in Chrome, the difference between raw 4K and YouTube 4K is apparent to the naked eye.

To my eye, the Vimeo 4K experience is much closer to the original. Watch the video below (make sure you set the quality to 4K), and compare to this YouTube version, see what you think.