The Sigma 24mm f/1.4 DG HSM Art lens is a great wide-angle prime lens announced early this year, when announced, there is only Canon EF-mount, Nikon F-mount and Sigma mount available. Today, this lens is also available for Sony A-mount, available for pre-order at Amazon, B&H Photo Video and Adorama.
The price for Sony A-mount is $849.00, same as Canon and Nikon mount, shipping date is within 2-6 months according to Amazon.