I just put the 27mm on my X-Pro and pointed it around the room with shades down and lit with electric light -- a dim room in other words, if not really dark -- and the camera focused in well under a second except in the dimmest places. (Shutter speeds were 1/30 to 1/85 at iso 6400, to give you an idea of the available light) Taking up the E-M5 (original) with the Olympus 25mm, the E-M5 was faster, but I didn't feel the Fuji was slow.
I use the 27mm lens on the camera about 90% of the time - and mostly legacy glass the rest of the time. The 40mm POV is just about like the 35mm rangefinders I first shot back in the ice age. The shot below was taken with it. It's plenty sharp and focuses quickly on the X-Pro 1. The 25's are better, but I like the field of view from this lens, and I've got the 50mm eqv. on my m43 system.
I got my X-Pro 1 in August after everyone knew a new version was on the way. If an optical viewfinder is important to you, you will love, unless you really do need state of the art, best in class auto focus. It won't give you that, but it will give you a shooting experience that is wonderful and hard to match.
Unlike Bill from Sunny Frimley, I loved darkroom work and worked at enlargers in custom photo labs for over 30 years, and I also enjoy working with my raw files. The X-Pro 1, though, and probably the entire Fuji stable, produce jpegs that are astonishingly good, frankly.
From one person who had wanted to the X-Pro 1 for a long time and finally saw a chance to get a kit I could afford, I say "just get it". I had thought of selling mine to get the new Pen-F, but I just cannot do it. I love the camera too much.
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