The X-Pro1 is nice but AF is nowhere near the Canon 1D MkIII body. Is good focusing in decent light but get dusty conditions or lower light levels with little contrast and it hunts for focus.
Image quality is excellent. RAW is all I shoot with it and love how it renders tones. Sharpness is just fine.
It is not a Sports or wildlife camera if fast motion is needed. I do shoot HS football with it. Use a 1dMkIV for the 400 mm lens and the Fuji with 14 for goal lines hoping to get the kid diving over right near the pylon with the camera at ground level, focus preset. Works great there.
Lightweight with a 14 and an 18-55 and you have a travel outfit that works well. Very good image quality all the way around. Night images are very good but you will need manual focus - also very good. I have shot with the X-Pro1 at 34 below zero in wind chills colder than 50 below and battery life is shorter than I like but the camera has never failed. Keep a few extra batteries inside the parka and change out. The 1D series batteries last for 1500 and more exposures under these conditions so if you don't want to chance changing batteries in extremes stick with the bigger Canons.
All in all I enjoy the X-Pro1. Will get an X-Pro2 once more are on the used marketplace. Its Focus is much better. Bigger image file is a bonus. The X-Trans sensor works well and the images hold up nicely when enlarged to 16x20's.
The price on used X-Pro1 bodies now is low and they are an excellent buy. Could take a vacation with one and the 14(or12mm zeiss) and the 18-55 and not worry at all. Even better would be the 35 f/1.4 along with the 12 and an IR filter as you can shoot InfraRed with both lenses with no hot spots. A nice bonus.
I do a lot of equipment photography as the farm gear is in use. Very few static shots - though most farm machinery does not move that fast. Image below is with the X-pro1. Blown up to 30 inch width without any problems, it looks very good in print.
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In use the X-pro1 is a fun camera. I have even photographed HS basketball and volleyball for news work with it. Mainly pre-focus or zone focus and wait for players to move into the area. These sports are pretty predictable in that regard. For a lot of images the light weight coupled with image quality given by the Fuji lenses is more than worth it. Another benefit is that when you go into some venues there is not any intimidation factor as you will fine on pulling out the 1 Series Canon SLR's. The small camera is more easily accepted than the bigger EOS bodies in many places and not perceived as a "professional camera". This is a good plus at times.
My vote would be to get the Fuji and enjoy things. At today's cost it is less than a lot of point and shoot cameras and interchangeable lenses are a real bonus. The Fuji lenses and Zeiss glass are excellent.
"I've been a procrastinator all my life. I keep meaning to do something about that."