To me the cape looks kind of cheap with all the stitching shown... In the movies I don't remember seeing lots of stitching on Vaders cape like it's shown on this statue... Not to mention the amount of hours you will have to spend trying to bend those wires to give the cape a natural flowing look...
As for Batman and Superman PF capes, I agree that was a bad design, there was no reason to make the capes so thick and heavy.... MOS statue from ResinWorx has a very thin and light sculpted cape that looks awesome with a wind ripple effect going through it....