I just bought a 14 F6C. The seating position is different. The sound is very different from my '13 B. The F6C feels very light compared to the F6B. I find my F6B handles better and is more comfortable but I love riding the F6C when the weather is perfect. To me it is a completely different feeling bike.
I've only had it for 4 days but I've ridden it all 4 days and I like it more and more every time I ride it.
For me it will be a 'perfect weather' bike. I refuse to add a windshield. If I need a windshield I'll ride the F6B. It is my slow rolling hot rod but it is very fun on the back roads. A little too much wind for me when I get up to 60 mph.