I'm a skinny guy, 188cm and 73kg, and the large fits me well in terms of lenght (reaches ca. 10cm below my crotch), a little to much room in the chest area, but thats simply because of me being a featherweight.
The jacket is really warm, and after a month of daily use, i can't say that i have noticed the down sinking together.
It's warm as heck and the snowskirt is ajustable enough to give even me a tight seal. The pockets are warm, so if you are going to use it in the streets on really cold days, you wouldn't have to wear gloves. Coldest conditions i have worn it in till now has been -16C and it tackled the test without a problem even tough i didn't move much. The fur on the hood makes it look a lot better, and actually helps keeping you shielded from wind and weather. It has lots of smart details, like a goggle pocket and a keycard "rewinder thingy" that makes being a skier much easier.
All in all an awesome jacket, and if you are in the market for something like this, buy it!