C1 is famous for displaying "pretty" images on first convert.
The old Nikon converter Capture NX was famous for this(with Nikon files only, of course). Even the current execrable Nikon Capture NX-D(a Silkypix product) has that seductive "nice color" look.
To my eyes, PN often has this effect with both Nikon and Fuji-X files.
Lately, I have noticed, and increasingly cannot ignore, the jacked-up midtone contrast in Photo Ninja, which, on some files, contributes to the better initial impression, but on many files just looks oversharpened.
Sharpening, in general, has been oversold. When I feel this way, the X-Trans conversion in Lightroom is like a pleasant vacation from the popular oversharpening look.