I had the Dell at my old job. Great picture quality! But 4K on 27“ is however still a compromise, since everything will show up too big when using 2x scaling. And when going for 1.5x or 2x things will get blurry. I now use 2x with smalller fonts in editors and browser zoomed out by default as a compromise.

But I’m really looking forward to have a real >200dpi desktop display for 2x scaling.