The fit is the same, but I would say they are more fitting, then loose. Hard to describe, but they look sharp for sure.
I wear a Large across all of the FJ line up, including Athletic Fit, and the 1857 line was the same.
The materials are definitely of the highest quality and construction. The both feel great, and look great.
Going to try and pick up a few more of the Stretch Cotton Dress shirt collection