The about $999 Sigma dp0 Quattro ($1099 with LVF-01) offers impressive detail for its pixel count. So much so that I would tend to prefer it over any 24-megapixel Bayer matrix camera. I hope Sigma takes the Quattro concept forward with the larger APS-H sensor for the as-yet-to-ship Sigma sd Quattro-H.
With focus stacking at f/6.3 or so it is possible to record tremendous levels of detail near to far as well. The photographer looking to shoot wide angle in a very lightweight and portable camera may find it appealing—I found myself preferring to shoot (carry) the Sigma dp0 Quattro instead of carrying the bulky Nikon D810 and the Sigma 24-35mm f/2 around (the lens I was testing at the time). It’s just such a huge difference in heft, and not that much difference in detail in actual practice once depth of field and lens performance are taken into account.
These examples give an excellent idea of the range and limitations of the Sigma dp0 Quattro.