I was in BKK 2 weeks ago staying at Aloft by W on Sukhumvit 11 but decided to try the Landmark Hotels buffet in the Huntsman pub down stairs.... very disappointing, poor selection and slow to refresh dishes. Meat was OK (Lamb and Beef) but nothing inspiring at all.

Have a look at this guys site.... http://www.at-bangkok.com/ they have some interesting reviews and mouthwatering photos with upto date pricing.

I think it could be Atelier next time I am up in town !!