The Sienna has more hand made details.. the shoulders are handmade and set as well as the sleeves..the canvas as well is stitched by hand.. what this does is that it allows the jacket to conform to your body a lot better..you will not find any half canvass suit mass produced that has hand work.. most are machine worked like the Napoli. In terms of fit the shoulders are narrower and the armholes a little higher with a lowered button stance then the Napoli. Funny enough out of my two Napoli's, my gray one has pretty high armholes and the other lowered armholes.. not as low as some of the stuff you see out there but still lowered than expected..The pants are pretty slim.. I'm lucky I have stick legs for my size.. anything beyond stick legs and waist will not fit in the pants I think. hand-work will always require more money in my mind as well..I have some full canvassed suits that have no handwork in them (Canali). All machine work if that gives you an idea.