I guess you are talking about the Panasonic 50mm f1.4 S Pro? Well, you might be right that having Leica endorse the lens raised the price. But consider also the Sigma 50mm F/1.4 DG HSM Art. It is similarly sized with a 77mm filter size, though weighing in at a lower 815g, costs about S$1,400. The Sigma in the L Mount is the same price as for that for the Canon, Nikon, Sony or Sigma mount. I am not sure if they need to pay Canon/Nikon/Sony for royalties, but certainly do not for Sigma, and certainly they do so for the L Mount.
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