While the 20mm/f2.8 lens does not get a lot of praise, it is reasonably sharp. The biggest feature, however, is its small size. If you want a pancake lens for your Sony camera, you should look at this lens! Better results than your 16-50 kit lens, and even slightly smaller. It does have a bit of geometric distortion and vignetting, but as always, stop down the aperture for better results.