http://www.mobile01.com/newsdetail.php?id=13633
(in Traditional Chinese)
I think the test pictures speak themselves and the differences in results are obvious. There is simple footnote for the camera in use with shooting information under each sample picture.
My overall impression is that for skin tone reproduction: Fuji is better than Leica > Nikon > Ricoh > Sigma. Well, it seems that the camera order in the review has already hinted us something!
As for the other IQ aspects of these cameras, just go figure out yourself! :-)
Related:-
Yet Another Ricoh GR Review with Full Samples
New Ricoh GR Review at DPR