As shown below, Sigma Photo Pro will not display images properly (does not use color management to screen), making it difficult to gauge color or brightness. Even for black and white work this is a big problem.
Workaround: set SPP preferences to Working Color Space for X3F Files= Same Color Space as EXIF. By so doing, color display is usable (still not accurate however). Then save images in ProPhotoRGB.
This issues remains as of version 5.5 .
The overlaid window shown below is the image in Photoshop that was saved by SPP.
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Sigma Photo Pro does not display color properly