I didn't expect much as I stepped into Restaurant Ethan, but I ended up being surprised by how authentic Hong Kong their food was. Certainly was not something I expected from a restaurant in Montreal.
First off, I must give a disclaimer that authentic food is not everybody's cup of tea. In fact, you'll probably find it rather weird unless you've lived in Hong Kong (or visited for a long duration). Otherwise, Restaurant Ethan will stir up a little sense of that nostalgia.
Do not expect the staff to be friendly. They expect you to eat, pay, and leave in an "efficient" manner, much like many of the other restaurants in Chinatown. They also do not speak a word of French.