I gotta say my last AC J TATL flight I'd rate the SD a 10. He personally introduced himself to everyone which I hadn't seen before, though I don't fly Intl. J regularly. Asked everyone if they wanted duty free then didn't mention it again, and checked everyone had a good flight afterwards. All staff I dealt with were friendly and attentive and I didn't get a hard time forgetting my pen.
And I very rarely post good things about AC. On which note... for my most recent domestic J flight the plane got downgraded and the crew were very much just going through the motions.