But, I have to believe that the Down Parka is a step up in warmth. It has down filling, right? And it looks designed to be the warmest offering they have for Canada winters.
For reference, the coldest it gets here is about 40-50 F and I feel fine with just a tshirt and the bomber. At under 50 F, I don't feel toasty in it, but I'm also not cold. I imagine, if it gets near 30 and it's raining/windy/wet, I would probably want another layer or the down jacket.