forget weights and ceramic bearings, how well does K-force shift over DA?
I've got a Dura Ace crank and an FSA K Force.
DA chainrings definitely shift quicker and crisper than FSA. The FSA's work, but if you're a stickler for crisp shifting you want Shimano rings.
FSA cranks tend to creak, DA does not.
FSA's single bolt design for both bering preload, and holding the crank arm on is inferior,imho, to Shimano's design where one bolt does the preload, and others secure the crank arm. ( The fact that FSA wants you to assemble it with Loctite 242, which no one carries, tells you there's a deficiency in the design.)
I would go with the DA everyday.
And by the way FSA repeatedly lies about the weight of their components.