If you're shopping for a wide-angle prime lens for your full-frame camera , or one that covers a standard-angle field of view when paired with an APS-C image sensor, you should give strong consideration to the Tamron SP 35mm f/1.8 Di VC USD ($599).
Quite sharp; Minimal distortion; Wide aperture; Optically stabilized design; Very close focus capability; Weather-sealed; Available for Canon, Nikon, and Sony SLRs
Edge performance lags behind center at wide apertures; Heavy for its size