You're flying out of T2. CSA use the AF lounge for their business class pax, and you can choose between that and AZ (assuming they haven't sold it already ). I've never been to the AF lounge, since the AZ one is nearer security, which is a traumatising experience that leaves me in immediate need of refreshment.
As far as the AZ lounge is concerned, the espresso is half-decent but nothing else is.