The new Tamron 35/1.8 VC is versatile and interesting lens. It offers a fast f/1.8 aperture combined with image-stabilization that is good for two stops in my tests. That makes this lens hold out longer in dimly lit situations. It produces sharp images right into the corner of a full-frame sensor and can focus close up to a magnification of 1:2.5 which is ideal for capturing small subjects. It's relatively small and light. The only thing standing against is the color aberrations of this lens which can be pretty nasty at times.

http://www.cameralabs.com/reviews/Tamron_SP_35mm_f1-8_Di_VC_USD/

The Tamron 35mm ƒ/1.8 Di VC USD SP offers decent results for sharpness when used at its maximum aperture of ƒ/1.8, and improves remarkably when stopped down. When the lens is employed on a sub-frame camera like the Canon 7D, the results are slightly better in the corners because the lens is trained on a smaller capture area.

http://slrgear.com/reviews/showproduct.php?product=1819

http://dc.watch.impress.co.jp/docs/review/special/1020095.html