FCS K2.1 vs K3

Hey, was thinking of getting some fins for smaller days to use on beach, reef, point breaks but mostly beach. Anyone using these fins in FCS?

 

I have the plastic k2.1 and the new fcs version of the k2.1 called V2 made from honeycomb…love them both. i belive that the k3 better for reef barrels and this type of conditions