Vera Francesc Casas (FB profile) has reached interesting conclusions by comparing the cutouts of a portrait taken with two different cameras and similar shooting parameters and similar lighting conditions. We examined the results of an X-Trans sensor in APS-C format compared to a full-format Bayer pattern and low pass filter:
I was doing a portrait last week. I took pictures with the Nikon D700 and the Fuji X-Pro 1. The results according to moiré seem overwhelming. On the left the portrait is captured by the sensor of the X-Pro, to the right is the one from the D700. It is clear that the pattern from Fuji gives better results than the Bayer pattern from the D700.