Comparing the native B&W of Agfa Scala--in the only two photos I took that day in October 2014 of the old school house--to the Foveon sensor in the Sigma. The first shot through the window was in color, then I switched the sensor to monochrome for the remainder of the shots until the cobblestone "driveway" at the end. On my iMac screen, the grain appears more obvious in the color shots of the interior than the monochrome, which the Foveon seems to show as a weak point in low light set on color. Still, low light might not be the Foveon's best friend, but, neither does it fail completely (see Big Bend 12/19 sunrise shots). It's curious looking at the Scala shots, from my Canon EOS Elan II, how more easily I could balance the interior light to the scene outside the far windows, another weakness of the Foveon. I do recall, though, the day shooting Scala was cloudy and yesterday was bright afternoon sun, so that can play a factor. Also of note: with the exact same shutter speed and aperture settings set on Landscape: Color & Monochrome, the color did a better job.