U2720Q HAS HDR

@XPS_Man  There’s a bit more to it than your large text answer.

@loving-dell  The “P” in UP2720Q stands for PremierColor. That means it’s highly color-accurate and supports advanced calibration capabilities that are important for people doing color-sensitive work. Unless you’re a professional photographer, video editor, print designer, or something similar, you probably don’t want that display. And if you don’t plan to calibrate your display, you definitely don’t.

I have found this non-Dell site for monitor comparisons pretty good. I search for the models, add them to compare, click Compare.

Thank you all. After receiving @jphughan 's reply, I've decided for the U2720Q. I'm using it with a mac book pro. Unfortunately I haven't found a driver for IOS, therefore I'm not able to rotate the screen and work with a rotated picture, which is essential for me. Do you have any solutions?

@loving-dell  It’s unfortunate that you didn’t mention that you were using a Mac sooner. A 27” 4K display is generally a bad choice for Macs, for reasons I explained in this post. But if you decide to keep that display, you should be able to change the orientation under System Preferences > Displays. The display image won’f rotate automatically when you physically rotate the display, and in fact I don’t think it will do that even in Windows because I don’t think the display has a gyroscope, but macOS should still allow you to choose a different orientation manually.