Several years ago I had time to kill at an airport so I went to the book store. I recall reading a book about Mercedes Benz car history and at that time (before M class)Mercedes had three classifications of cars: S - Super class, E - Executive class, and C - Compact class. According to the book the C class is Mercedes economy class, the E class is Mercedes mid class, and the S class is Mercedes high end class of cars.

Hope this helps.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles