When Mercedes-Benz renamed its crossover line a few years back, the theory was that it better aligned these high-riders with the automaker’s traditional cars. The GLK morphed into the GLC, the ML became the GLE, and the GL added the S-Class’ S (short for “special”) to its name. With these changes in mind, it’s reasonable to assume there’s some relationship in terms of quality and poshness between the crossovers and their car-based siblings.

But in the case of the Mercedes-Benz GLS-Class, it never really felt like an equal to the legendary S-Class. Mercedes’ flagship car was an immaculate, hewn-from-granite thing with the best materials and the best technology. The GLS felt shoddy, though, with none of the S-Class’ polish or poise in its driving character.
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https://www.motor1.com/reviews/409085/2020-mercedes-benz-gls-580-suv-review/