Russ,
Wow. Wonderful. I really do like that. I did try a BW conversion some weeks ago but I couldn't pre-visualise what I might be aiming at and so abandoned the effort.
Now I can't decide which one I like better. Actually, there is no reason why I have to decide... both are different and both have their own merits. I like my colour version because of the way the colours transition from the almost harsh and vibrant colours at the bottom to the subtle pinks and oranges as you go up the mountain - the effect is a bit like a certain kind of oriental art. Your BW version is quite different - makes the mountain look much more looming and huge, and somehow floating above the subtle greys of the lower slopes. Your interpretation is successful in getting close to conveying the scale of the mountain and for that reason alone I love it.
Incidentally, from the Department of Interesting but Ultimately Useless Facts, Mount Kilimanjaro is the tallest freestanding mountain in the world. From the base where I took the shot at 3,200', to the summit at 19,300' the vertical height is 16,100'. That is big. Really. Big. For comparison, the vertical from Everest Base Camp (17,520') to the summit (29,030') is 11,500'. I don't have GPS on my camera but I know roughly where I took the shot, and the straight line distance from me to the summit is about 30 miles. Just think about that. It is like standing in Dover and looking at something in Dunkirk, France. Or for any Americans without passports, think of standing in Times Square NYC and looking at something in East Brunswick NJ. The thing is enormous and quite hard for the human brain to take in. And it is very hard to take a photograph which even gets close to conveying just how damn big that thing is.