This is one of my preferred All You Can Eat (AYCE) sushi restaurants in Toronto. I have been a half-dozen times over the last few years.
For an AYCE sushi experience the fish and portion size is very reasonable. The AYCE includes all sashimi, nigri and maki on the AYCE menu - so there is a chance to have a great variety of food. The fish is fresh and cooked food is tasty (although I tend to stay with the sushi menu items).
The service has always been consistent - prompt and pleasant and for the price Kuni Sushi Ya is a great restaurant.