If you are to believe this Australian website, the price of the new, "crazy good" Sigma 50mm f/1.4 DG HSM Art lens (see specs and more info here) should be 1,499 AUD with tax (around 1,350 USD). Sigma has not officially announced the price or the release date, but the lens is expected to be significantly more expensive than the 35mm f/1.4 Art.