Lens feels sturdy and focus etc is smooth.

It's really easy to determine accurate focus with the X-Pro 1

Sharp, well-built manual focus lens that works like a charm on my Fuji X Pro-1

The focus peaking with Fuji also make it very easy to check what will be in sharp focus when composing

Such a wide focal length means that you can leave this lens at infinity and have just about everything past a few feet in front of you in sharp focus

too stiff and infinity focus/marking is often inaccurate and different depending on your copy.