What are the chances - I stopped by The Best Things today to "feel" a 10" Nogent. Turns out it was the last one they had, maybe the last one period. Needless to say, I bought it. It must be my lucky day.
I also have a Carbon Sabatier **** Elephant 10" and the blade of the Nogent is noticeably thinner and lighter. I am not sure about compounds or relative hardness, however. BDL is probably the best authority on that.