Tusker/Jiko
I thought Yak and Yeti was a poor excuse for expensive chinese style food. And Boma I was never really impressed with. But that's just my opinion.
Tusker has an amazing choice of food, although the food is not for the non-adventurous. Jiko is good, they are very well known for their selection of Wines and the filet (before it was off the menu) was the most tender filet I have ever had.