Sigma 30mm f/1.4 EX
I picked up this lens as a special on run-out, as it has been superseded by its more "Arty" cousins.
Performance matches the published reviews, i.e. Sharp in the middle, less so at the edges, particularly wide open, where there's also some vignetting. Focus is fast and accurate; exposure/aperture function is good. Full-time manual focus is available.
Field performance was quite encouraging, and it's a nice focal length on DX Nikons.
Any other comments on this lens?