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Color Fringing: X3F Corrected vs Uncorrected vs JPEG
The lens in the Sigma dp0 Quattro is very good, but it does have some weaknesses, including mild color fringing.
A serious limitation of JPEG in the Sigma Quattro (and Merrill) cameras is the lack of any correction for lateral chromatic aberration. Many times the JPEG may be very good, but suffers from color fringing (dp0 and dp1 Quattro in particular). This forces processing in X3F (or seeking out alternative tools to deal with it in the JPEG).
Color fringing example
This example was processed from X3F raw here in order to correct color fringing (lateral chromatic aberration), particularly at the upper left corner of the frame.
See the crops that follow for X3F corrected and uncorrected vs in-camera JPEG.
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SIGMA dp0 Quattro + 14mm f/4 @ 21mm (14mm)