Sigma is largely known as a lens company, but their mirrorless cameras boast some pretty unique tech. The SD Quattro (not to be confused with the higher resolution SD Quattro H) incorporates the company's three layer sensor but starts at a lower price than its predecessor.
Instead of using a filter to allow the camera to capture color, Sigma's Foveon sensors instead use three sensor layers, one dedicated to each color in the RGB spectrum. While Sigma may be less well-known, their previous cameras with a similar sensor design have been well received.
Sigma's earlier SD1 Merrill used a similar sensor design, though with more megapixels and a better autofocus, but retailed at $2,229 body-only. The Sigma SD Quattro lists for $999 -- and that's with a bright f/1.4 lens.
While the rest of the camera's specs are so-so like a 3.6 fps burst speed and a 9-point autofocus system, the sensor technology at the lower price point could be enticing for a few buyers. Sigma also recently announced the SD Quattro H -- which has a larger sensor but doesn't yet have a list price.