There are two locations of Momiji in Toronto, and Clarkson is by far the better one. The location in Etobicoke lacks in service and food quality and is very much a few stars down on the scale, in my opinion.
The Clarkson location serves the BEST Salmon Terriyaki EVER! Having eaten recently at the Clarkson Momiji (and many times in the past), I couldn't believe how PERFECT my Salmon Terriyaki was. Easily the best such dish I have ever had. The salmon was grilled perfectly to a warm pink center with the perfect terriyaki glaze and presentation of rice and grilled vegetables. For $19, it's one of the best dishes I have ever ordered, anywhere.
Their sushi is always fresh and while the sake sushi is sometimes on the "fatty" side, the portions are normal to large and the nori is always fresh. The food is presented in a modern setting with nice tableware on black stained tables.
If you visit in the winter, it does get a bit cold closer to the door. They have a great takeout service with the food well-packed and organized.
While they specialize in sushi and maki rolls, there is a wide selection of non-sushi dishes. The service is friendly and perfectly on the slower side :-)