X-post from What are you wearing. This is the Hudson in wool/cotton from SS 15. Still one of my favorites. Shirt and tie are also SuSu. Pocket square is from Gagliardi.
44L definitely fits slimmer, and I had to have it let out slightly in the body for this reason. Length wise, there's no real difference between the two other than in the sleeves - both fit well and go over my jacket sleeves (as they should on a coat) but the 44L is a smidgeon too long. In hindsight, I would probably just order a 46 in all outerwear fits going forward.
I can't comment on the Vicenza fit though, sorry!