Runs small. Ordered a XL, I wear a size 46 coat. The arm holes are quite small and it cuts badly into my pits.  The sleeves circumference is fitted as well and It doesnt seem it will stretch out any. Im trying an XXL soon. If you are muscular or bulky, for sure order up a size or maybe two. The collar and hood circumference is small as well.  The hood has a smaller zipper than in the photos and is very floppy and doesnt attch any other way.  I have a size 18 neck and cant remotely zip the jacket past the bottom of my neck or connect the velcro together on the hood.  Ive never had an issue with that on any top brand (Columbia, North Face, etc.)

Other than that it fits perfectly (sleeve/torso length - Im 58), and seems well made.  It really is close to being perfect if those few things were fixed.
If you are not muscular or balky, and have a smaller neck, it would be perfect.
I hope the XXL works.

Update- the XXL coat (yellow piping) fit, but it was in many ways a different coat. More insulation, the hood was attached far better, but the cut was less refined than this coat. I wanted a clean cut coat for business travel. The coat with yellow piping was a sloppyer cut.  It is clear that they are not using standard sizing or even comparable sizing to create this coat. Materials are good though.  Like I said above, they are very close to having the best heated jacket out there but the issues are to great to overcome.