TrustedReviews have looked at the Sigma SD14 Digital SLR

The Sigma SD14 is unique. It is currently the only camera that uses a 14-megapixel Foveon X3 Direct Image CMOS sensor, which operates on a different principle to the Bayer-mask mosaic sensors used by every other digital camera on the market. It isn’t the first one to do so, since the two previous Sigma digital SLRs, the SD9 and SD10, used earlier smaller versions of the X3 sensor, but since those cameras are no longer in production the SD14 is the only model available that uses this innovative technology.

Sigma SD14 Digital SLR Review