Again, Canada does not have the leverage, the economic muscle, to force UBS to provide a list of clients. In fact, the arrangement that the United States had with Switzerland was within the context of the existing United States-Switzerland tax treaty, which provided for an exchange of information relating to matters characterized as tax fraud rather than tax evasion.
It was one that had to be settled, because UBS could not be allowed to fail. It was one that Canada simply could not work. There's no way that Canada has of compelling the information, and to the best of my knowledge the CRA has stopped its attempts to try to get that information.