I've shamefully not tried a majority of sushi places in Toronto, but I've been to enough that I can say Momoyama is great! When it comes to special occasions with the wife, Momoyama is our choice more times than not.
When we go, we'll order a 3-4 person mixed sashimi/sushi boat and always comes away very happy. Quality is great, service is great. The prices while not cheap, are reasonable for the quality you are getting.
I highly recommend!