It’s fine for Phase One to say the Capture One 12.1 X-Trans processing has been improved, but can you actually see the difference? (It was pretty good already.)
X-Trans sensor
A sensor layout unique to Fujifilm which replaces the usual bayer pattern of red, green and blue photosites with a more ‘random’ arrangement. Fujifilm says this eliminates the need for a low-pass filter to combat moiré (interference) effects, resulting in sharper fine detail.