It is a little higher, so for someone with a bulkier build the lapel may bow. But it works great for me, even better than the Southwick jackets, I'd say. The higher stance, which gives it a smart, less-shrunken appearance, and the slanted pocket flaps, which look mod and rakish - make for a great look. Shoulders are excellent, too. Having said all that, I think this crop of Samuelsohn jackets have been tweaked. Mike?
I have the chestnut plaid Samuelsohn sport coat in a size 40, the same size I take in Southwick. My Southwick coats need a little taken in on the sides; my Samuelsohn fit me right off the rack. The soft shoulder and unstructured fit works well for me, and so does the higher button stance. But I know some have done less well with the button stance, finding it restrictive.
I'm thin - 6', 155 pounds - but shoulders are tight and sleeves are short on me in a 38R, so I normally go with 40R and make the normal adjustments. At any rate, I got the heirloom in a 40 and find the fit nice and sharp.