I purchased the Ultra Lochi Jacket 2.0 (Reversible) in XL. I’m 5’11” and 200lbs with broad shoulders and the jacket fits great. Thermal properties are even better and it compresses nicely too. Love the green/black color combo. Only complaint is the main zipper - the teeth are small and it tends to get stuck frequently. Fix that and maybe stow the hood in the collar on future iterations.
6'0 and weight has ranged from 180lb to 210 over the past decade. Fits me just right as an L (comparable to Arcteryx sizing). If I were closer to 180lb these days it might be a bit loose. Sleeves are a little long/wide compared to a comparable Arcteryx jacket.
I'm inclined to agree with other reviewers who have said that the cuff velcro is a bit overdone, stiff, aggressive, large, etc - On mine, the male-side cuff velcro is beginning to eat away at the sleeve fabric and pull material away - only major quality gripe thus far.
Overall, the jacket is workable as another shell in the wardrobe, especially layered with a fleece underneath in sub-freezing temps.