I had sushi and sushimi at many other restaurants, and never did I like them nearly as much as at Echo Sushi. Echo Sushi is this tiny Japanese restaurant just north of Davisville station; because it's so small, it's easy to get a waiter's or waitress's attention, which is especially beneficial when you have all-you-can-eat. I always take my friends to this place, and everyone loves it.
Recommended: plum wine.