You can also use a scheme like the Olympus super-resolution mode where the body drives the sensor using the stabilization voice coil. This totally eliminates chroma boundary artifacts caused by the Bayer filter, and reducing one of these 64MP raw files to B&W looks perfect. The technique is borrowed from Olympus' microscope business (the one that actually kept them in business all these years). I believe other bodies are offering this feature now. Of course there are tradeoffs. The technique is only good for still subjects and the camera must be mounted, because the stabilization does not operate in this mode.