This place definitely serve the best sashimi I had in Montreal, by a long shot. The fishes are so fresh. You get 4 good sauces to dip your sashimi as an alternative to soy sauce. Their nigiri are very good as well. There is no sushi menu, instead you just get the Chef's choice of sushi, but you can probably ask for specifics.
I will definitely return whenever I need a real sushi-fix; for anything else, go elsewhere. Their soup was underwhelming, even the scallop appetizer. Don't bother with the tasting menu. Just get sushi dishes.
The dessert, well though it may look nice, is way overpriced for tiny bite size cakes. Do yourself a favor, and have your dessert at a nearby bakery or even coffee shop.
The ambiance is typical casual restaurant. Just don't sit near the door during winter...