got it charged, but not willing to unplug it to test, so a quick shot out the door:

http://projectftm.com/#H-6GJlHgGFA8Yek86MrkVw "Neutral Density" unedited but cropped

I'm too much the artist, I find. I tried shooting my D850 in B&W and it's as good as I would expect from a color sensor with a Bayer filter. But it feels like I'm just giving up all the degrees of freedom Lightroom can give me when converting a color raw, and there's a degree of "push" and "pull" processing flexibility that doesn't seem easily replicable by other means.