Wii Fuji use a normal sensor for next X ?

The X-trans sensor certainly have some nice qualities; good dynamic range and great ISO performance. But there are also some issues and flaws. Take a look at this picture samples from DPreviews Studio Comparison Tool. 

Resolution: You can read "FILADELFIA 1876" in all the samples except the X-E1. On a pixel level the picture looks soft and smeared out. Although there is no AA filter, and some tests claim different - the res does not seem as good as the contenders in this example. This is all pixelpeeping of course, but indicates lack of resolution and sharpness in the final picture.

Color Bleeding: The white text PREMIATI have red color bleeding all over.

Switching to JPEG does not change the outcome; the result is not due to inadequate RAW processing.

There are also the issue with "fractal artefacts" that sometimes occur with fabrics and patterns. Not shown here though.