It seems that the autofocus (AF) speed of prime lenses on Fuji X-Pro1 and X-E1 cameras is one of the most discussed topics on Fujifilm X system forum on the dpreview site (example). Obviously, anyone used to (D)SLR cameras should notice the difference in autofucus speed in most mirrorless cameras. Several factors contributes to slow AF on compact system cameras. First, the focus speed depends on lens and lens' motor and not all lenses are created equal. Out of three available prime lenses, XF60mm F2.4 R Macro is the slowest which is not surprising considering that it is a macro lens. New XF18-55mm F2.8-4 OIS has different motor and apparently focuses fast but independent in-depth reviews on this lens are not yet available. Second, mirrorless cameras use different method for autofocus, so the tricks and skills from DSLR world may not work anymore. This post explains how to improve the AF performance on mirrorless camera (Fuji X-Pro1).
For anyone interested in comparison between Fuji X-E1 and Sony NEX-6: here is a very comprehensive comparison of the two cameras. Later in the thread the author of original post wrote that in some situation with dim light Fuji X10 might be better than the Sony because of the bright lens. Yes, the X10.
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