Spent 4 nights at the St Regis Istanbul a couple of weeks ago. I chose the breakfast as the Plat amenity (no 500 points posted).
The breakfast is served in the St Regis Brasserie, which is the street-level restaurant. I quite enjoyed the quality and variety of the breakfast spread. They also indicated that made-to-order omelettes were included in the Plat breakfast, but I didn't order any. Service was very attentive, friendly and professional at the restaurant and throughout the rest of the hotel.