If you love Japanese food, this is the place to go for it in BKK. The atmosphere is nice , the prices are reasonable and the cuality of both the food and the service is quite good. I visited the restaurants of Terminal 21 and Central World, the latter is bigger but both of them can get really crowded at meal times , so if possible try to dine early and you'll enjoy a wonderful experience.
There is a menu in English and some staff members also speak in English. There are lots of Japanese dishes, not only sushi and everything is delicious!.