I'm not arguing, especially since you like the FKH , BUT I really like the geometry I've seen and I love how the steel cuts and feels on the stones with the FKH.
To me, not having quite as good edge retention isn't a big deal, since I'm not a professional. The reactivity is something that gets less and less severe (virtually imperceptible) over time.
But I would think not having to worry about the carbon issues, and having the plusses of carbon sounds pretty damn good!
If the price increase doesn't bug you, it sounds like a winner!