Perfect in what way?
Personally I don't see the point in CS, mixing carbon ribbons and polyester, other than trying to sell something "fancy" at a cheap price
. Technora is a far better supporting fiber for carbon and GPL has been a good fabric
for many years. But in saying that a good membrane sail has a lot better shape holding. Companies are starting to offer liteskin or equivalent skin on membranes which offers more durability but more weight than film. Its not as durable or as heavy as Taffeta's which are the normal for cruising laminates. In my opinion the liteskin seems suitable for club racers who want to get some more durability out of their sails
without to much extra weight.