I may be wrong, but I believe the coffee bar is still open in the mornings, while the sushi bar is open 5-9pm only.
The sushi bar has about 6 seats at the bar, and about 15 or so seat along the window. (sorry I didn't count, just guessing). 2 weeks ago, we had the tempura shrimp roll and something else (forget, as I didnt eat it). The tempura roll was good, but I made the mistake of comparing it to the one at CG....they are prepared differently and CG gets the edge. Everything was fresh, and if you are eating at Kona all the sushi is available to order.