When I flew to LHR in business class (or Executive Class as they call it) on AC, I deliberately chose to go via Toronto, rather than my local airport (Ottawa) so I could ride the Airbus rather than 767. I was thoroughly unimpressed when I saw a 767 parked at the gate. Unfortunately, manintheback's assessment is spot on regarding their product and cabin crew. I am going to Paris later this year via Montreal, very relieved to by on the 330.
I've been underwhelmed by Swiss as well as KLM, but to be fair, I've never been in the pointy end with them.
I regularly fly the Ottawa/LHR route in the 767 in the back, and am waiting for day when the 787 is introduced. It might be some time...