I'd strongly second Chapel Hill Guy's suggestion of Café Too at the Island Shangri-La. An amazing assortment of many, many different types of food, and each dish seems better than the next. Among Pacific Place eateries, the Shang buffet is heads and shoulders above the Marriott. I also understand that the sister hotel, the Kowloon Shangri-La, has a new restaurant that pretty much creates the same buffet.