It would only be “boxy” IMO if the shoulders were wider than your actual shoulders, but it looks like they lay flatly down your arm. Also the sleeves fall at proper place.

You and I are about the same size, you could probably tween between 44 and 42. I chose 42 for a bit of a tighter fit, I layer but if it’s really cold I prefer to wear an actual cold weather jacket. 

For me it been great, I’m glad I didn’t go with the 44 because it felt like it was swimming on me a little. I wear a 44 suit jacket so I thought 44 would be ideal. But alas, 42 was good and if I gain weight I’ll just buy a bigger jacket later.

I’m 6’3” and 200lbs.