I also just received my first Jantzen this week(after only about 2.5 months waiting). The fit is way off, but I am blaming myself for mis-measurement. I measured a shirt I had MTM in thailand that fit very well, but I think it is better to measure my actual body instead for the next round.
Unfortunately the sleeves are both a little too short and the cuff way too tight for it to be serviceable. I was also going for the much discussed "mid-length" that allows for both tucked and untucked wearing and that was a bit disasterous as well.
I was very happy with the construction and the detailing though. After washing I will post some pics. It was Stripe #447 by the way with an italian 2-button high collar. I think I may have just tried to add too many bells and whistles and the resulting conglomerate and the poor fit just isn't going to work. I chalk it up to a learning experience and a small price to pay once the fit and the preferences are all dialed in. I am excited to reorder, especially with all this talk of a cocaine fueled Jantzen workshop and 2 week turnaround times!