My 150CF is blazingly sharp. And its my #1 go-to lens when I use my Hasselblad kit.

Of course "blazingly sharp" is when its correctly focused

and the cost(low if you buy right) of entry with a 150CF is pretty darn tempting. I'm not sure what a 160CB would go for, but since its newer, I'd imagine it'd go for more $$$ than the CF, even one in good condition.