One of the most expensive meals I have had in HK is a Japanese wagyu donburi (rice bowl) with tamago (egg). It was as delicious as some of the Japanese food I had in Japan during my trip there over the holidays. It was at a restaurant called Fifth Element Shokudo inside of a shopping mall called The ONE. The restaurant also offered other interesting dishes, such as miso-dough based pizzas. While it's definitely more expensive, I think it's worth going to at least once, or for a more special occasion when willing to spend a bit more on a meal.