Ematei is one of the authentic Japanese restaurants. Compared to other Japanese places in Toronto, their strong points are Sushi and Fish-grill.
Matsu sushi set is classical sushi set where you can understand how one piece of fish is different from another, especially in texture---Forget about those Chinese/Korean sushi places with over-fabulous rolling and decos. This is what good, authentic and safe (a real story) sushi should be.
My favourite hot dish is their cod fish dishes. The waitress told me they no longer serve grilled black cod fillet (gintara-yaki) (~$15), but you can try grilled black cod neck w/ radish (gintara kama daikon) ($7) instead. The portion is smaller, but the fish is samely good. My feel is that the raddish matches fish well.
If you are not sure what to eat, try bento box.
Their donburi and tempura are just so-so. Never tried their curry yet.