I saw the Nikon Df today at my trusted camera shop. Herewith a comparison between the x-pro and the Df. I was able to hold it and try it a few minutes. My apologies for the comparison shots. They were taken with my iphone and I could not get a good angle and lighting. But you'll get the idea.
First impressions:
1. surprisingly lightweight, also with the new 58mm 1.4 lens. There is a lot of rubber, so the x-pro1 feels more sturdy. The camera looks much bigger than the x-pro1 but it does not feel bigger.
2. shutter sound: very acceptable. Not like the D800. You hear it but it's not disturbing.
3. handling: it feels very comfortable in the hand (better than the x-pro with grip). The grip is tiny though. Controls are intuitive. Changing shutter speed and PASM settings can be done without taking your eye of the viewfinder. Changing ISO and exposure compensation cannot.
4. The big button on the right front side of the camera (next to the Df sign) is actually a wheel to choose aperture. I prefer aperture on the lens
5. AF muuuuuuuuch faster than the x-pro and less noisy. Very snappy. But I would not expect anything less for a D4 in a smaller body.
6. Viewfinder: mmmah.
7. Looks: a matter of personal taste. I'm not sure yet.
Is it a "serious compact"? Don't know but it definitely is a lot smaller and lighter than the Nikon D800. To me this camera is a serious alternative for the x-pro1. But then again, the A7/A7R is an alternative as well.
BTW: the 58mm looks like a fantastic lens with a surprisingly low weight.
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