Shunyata Sigma VS Shunyata King Cobra CX

I was wondering if anyone has compared the Shunyata Sigma to the Shunyata King Cobra CX. I am not talking about the older King Cobra V1 or V2. I am talking about the last series of the King Cobra CX . I do not want to hear about the other Shunyata series but ONLY these two. I Just purchased a Shunyata Sigma HC 20A and now i am looking for a Shunyata King Cobra CX. I  recently read on line somewhere that the Shunyata King Cobra VS Shunyata Sigma. The King Cobra is still the KING.