The ability to shoot in greyscale and bring the color in via post processing is one of the advantages of digital cameras. Grey scale is just so much better at capturing a wide tonal width.
One thing I would be curious about is the color response profile of the greyscale imager itself. That is going to put some kind of bias into the results.
you may be familiar with the Leica M....for Monochrome camera.. here on earth.
for thse who are going to create only monochrome pictures..
nope..... its out of my range