Ergonomics
This is the downside of LED monitors and for now manufactures don’t know how to build thin bezels. The panel of the XL20 is 9 cm thick and Samsung carefully avoids showing it. The only pictures published show the monitor from the front or with light protection.
This detail might be surprising for the general public, but not for professionals, because pro monitors (Nec, LaCie, Eizo...) are generally quite big. The XL20 only confirms this characteristic.

The monitor is vertically adjustable, but it is very big. For comparison, here is the Samsung 204B, not really an example of thinness, and the XL20.

We don’t necessarily demand that monitors be ultra thin, but rather to have good rendering and this mostly means “good for colors”.
Knowing that the panel is an MVA, we will not only make do with a color analysis as MVA are generally very fast and have better than average video. Therefore, these tests are also on the menu!