To me, I only know Kempinski in the context of the Vier Jahrzeiten, Atlantic, Adlon, Ciragan Palace and the Emirates Palace. I guess that they lack presence in New York, London, Paris, Hong Kong, Tokyo, etc may hurt their exposure to us here in North America.
Perhaps my first introduction to a Kempinski was the Hotel Adlon and it was a very poor introduction to the brand that I have simply dismissed the brand altogether.