From an acknowledged expert on the Leica system:http://www.imx.nl/photo/page152/files/archive-11-march-2012.html
"The X-Pro 1 is not without shortcomings, but in the area of recording performance does not only challenge the Leica M9, but might even surpass its image quality.The 1.4/35mm lens is unexpectedly good and is capable of challenging the Leica Summilux-M 1.4/50mm ASPH, the reigning champion of high-speed standard lenses for precision miniature cameras. "
I'm not much for pondering MTF curves or pixel peeping but am fond of the OOC jpegs I'm getting from my Xpro-1.
There was a bit of a kerfuffel (imagine that) when DPreview recently did sample raw conversions with a beta Adobe Xpro-1 raw converter.
I'm not concerned as I could live with the jpegs - never thought I'd think that.
Love the form factor of the camera. Have no complaints about the focusing. Use it mainly with the OVF.
For me it is the most fun I've had with photography since I moved from film to digital.