I wore my Abisko anorak (over a double layer of Aclima doublewool and a Devold Nansen sweater) at -47 (plus wind-chill) in Alaska recently and was comfortable whilst walking and doing moderate exercise.
I haven't tried my new Kebne yet, as I'm back home, but first impressions suggest I'll be OK at rest in similar weather with this and the same layers.
The same size feels more snug (due to the insulation) but comfortably allows the same layers underneath, although I suspect it will need to be "seriously extreme" to ever need more than a single base layer.
Immaculate work as always and since my Abisko and Hamra pants remain like new after years of hard use, I expect this (and my second pair of Hamra pros) will become a family heirloom!
Cloak, hat and mitts as soon as I can persuade the bank manager into allowing me to order them!