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Having sailed in both CC and a Sky Suite on the Century as well as the Summit I can say they are closly related. The butler is great if you need one. We found ourselves not really using the butler. He was so nice I could not see kyself rudely asking him to do things I could do just fine myself. On the Summit, the Sky Suites are located adjacent to the CC cabins and are a bit larger, onh the Century, the Sky Suites occupy a floor by themselves which is VERY nice! No lids running up and down the halls at all hours. On the Summit - CC, on the Century - Sky Suite! Just my opinion for what it is worth.