As a quick comparison, I’d say the NFC is heavier in the hand, and much more “tippy” then the 888. When I did a side by side comparison of the two, you could feel the 888 flex deeper down in the butt section, however the 868 flexed more towards the top 2 sections. I’m guessing part of that is due to how thick the butt section is on the 868. You could likely over line it to a 9wt and it would still toss it nicely. I didn’t fish the NFC, however I’d guess the 888 had a more parabolic bend then the 868.
Again both rods are awesome!!! This is the second Iconglass rod I’ve built, I’m still tempted to build myself a 8wt or 10wt iconglass