Excerpt: I bought this lens as a walkabout lens for foul weather conditions. So far I have not experienced bad weather. My other lenses are Zeiss and I do not choose to risk glass of that price under such conditions. My testing indicates the lens will do fine for its purpose.
Summary: This is my walk-around lens for my A6000. It's a really good lens, for the price. If you use Lightroom, which has a lens profile for it, you can easily fix photos taken with it (barrel, etc). Definitely my favorite Sony lens to date.
Summary: - Sharpness is very good in the center (most of the frame actually) wide open, while slightly soft in the extreme corners (only). Stopped down the center becomes great while the extreme corners get quite decent. If you want perfect corner-to-corner sharpness you should look elsewhere, though.
Pros: Portability/compactness, good sharpness, decent bokeh,
Cons: Nothing really except, perhaps, that it isn't spectacular in any area (other than compactness)
Summary: Sharpness on picture's borders and on corners much better than its Sigma's sister. Sony's lens doesn't beat Sigma in the center. Generally this Sony lens provides at least not bad optical quality, especially in terms of sharpness, contrast and coloration.
Excerpt: I purchased this lens to make a slim package with my NEX-7 to allow me to carry a camera at all times. So many pictures pass without a camera available. This lens corrects my bad habit. On the other hand, to be kind, this lens is not sterling by any means.
Pros: Clever Compact Lens Hood, Durable, Easy To Use, Fast Focus, Lightweight, Reliable
Excerpt: Quick note: bought USED here for its compact size and usefulness as a city/landscape walkabout option that would have minimal battery drain (no zooming in and out). I don't normally buy used, but this was rated as a 9 (it was!
Summary: This is a Very Good Lens ! I use it on an NEX 7 , and I am very pleased with the Results ! I used it at Gettysburg Battleground last Fall , and it and the 32mm Touit Zeiss lens are a Wonderful combination ! For most situations I use the 20mm , as it is so compact , and small !