This is shockingly warm for the weight. As others have said, I think the fit is somewhere between the standard and expedition, but it has enough stretch that it shouldn't be an issue. I've found it has plenty of space for a base or two and the dasche L3 under it with plenty of room for another shell if needed. I think the confusion would come with the ARX L6, as that jacket in the same size is much larger.
The torso is a bit poofy when seated though, in part due to the large flat panel front. This can probably be fixed by raising the lower zipper. The waist cinch points are some of the easiest to adjust I've used and this has become the first jacket where I actually use them.
As one of the long-size-only customers, the sleeve and body length are as usual perfect from Beyond. For reference I'm 6'7, 155, and wear the Medium long. It's probably best suited for someone up to 170-180.
The only true negative is the hood and neck when the hood isn't in use. It's pretty much impossible to have the jacket zipped closed in a comfortable manner. The chin portion of the hood makes the opening too tight and results in the need to keep it about 1/4 open to avoid hitting your face with the collar. When the hood is up, it's perfect, so I understand the tradeoff. With that in mind, this is definitely a single-hood layer. Don't expect to wear the dawa sherpa under it without a ton of bulk behind your head.
Overall a great value, especially for tall customers that are normally stuck with cheaper, low quality alternatives from the competition.