Another Calgary owner here, and I can confirm that it is a damn warm jacket. You'll be fine in just a t-shirt underneath. If you go indoors (e.g. into a mall) you should remove it immediately, or you'll be sweating after 5 minutes. That being said, I love it for Toronto winter wear. People who say "Toronto doesn't get cold" are just hating on the city. There were some particularly brutal days last winter when I certainly did not regret my purchase... a coat is supposed to keep you warm!
I love the CG Japanese line, but I can't get behind any of the regular CG parkas as fashion wear. They seem completely functional, like hip-waders. Necessary when you're out in the field, but otherwise not to be worn.