Just posted: our review of Sigma's SD1 Merrill, the company's flagship 15MPx3 DSLR. The SD1 is the first camera to use the latest APS-C Foveon sensor, which detects three-color data at each location, giving what Sigma says is resolution equivalent to a 30MP conventional Bayer design. We've used both an original SD1 and SD1 Merrill, which are identical in terms of function and output, and the review reflects the behavior of the latest firmware for each. So does the no live view, no video SD1 deliver enough to carve out its own niche?