I've been using my CC4 a lot this year.
I'd say I like it equally to, if not more than, my DoubleStuff. I love it. I find myself reaching for it far more often than I do the DC4, especially now that the ceramic side of my DC4 has cracked.
My ideal in the field would be the CC4, which gives a fantastically sharp edge and can be used for 99% of sharpenings, but a small DC4 style diamond stone just in case of some heavy work needed on a badly blunted blade.
If someone with more talent than me was able to modify the pouch so that the front, smooth leather which has the Fallkniven logo and everything on it, instead had some way of permanently mounting the diamond part of a DC4, then I'd buy it in a flash. I wonder if some kind of bonding agent would work betwixt leather and diamond stone?