Glossy coating
I also just wanted to quickly highlight the glossy coating used on the 27E3U7903, rather than the matte finishes we are used to seeing. I've put it next to the Apple Studio Display again and you can see a similar mirror-like reflection, though both have a slight anti-reflective coating that gives off different hues.
Ordinarily a glass finish like this means no coating grain, but I was surprised to see a small amount visible on the 27E3U7903. I wouldn't say it affects text clarity, as you can see from the above image.
However, it is visible – particularly on light backgrounds – when the same can't be said for the Studio Display. It's definitely not as visible as with the ProArt PA27JCV and its heavy matte coating, but it's also not accurate to call the 27E3U7903 a ‘grain-free' monitor.