Sony doesn't have a whole lot of selection for full frame in the 35mm focal length. There are really only a couple of options. The new Sigma or the Sony 35mm 1.4.
I chose the Sony version, used, so it runs about the same cost as the new Sigma will plus it will work on the new AF-D. Sony's new dual AF system on the a99.
So far I am very pleased and also wrote a short review.
Sony SAL-35F14G - 35mm f/1.4 G-Series Wide-Angle Reviews
a99+35mm by Cosmonaut's, on Flickr