Originally posted by gavinhw I'm continually scratching my head about the mixed reviews for this lens. Lenstip and this website were not exactly impressed with the lens's corner sharpness till the lens was stopped down. The Pop Photo lab results do not seem to show this IQ shortcoming, nor do other reviews. Users seem to love the lens, however.
Maybe there are quality control issues?
I think this was a tough lens for a lot of people to understand. A relatively short focal length, not super speedy aperture, but a small physical size. People were constantly comparing it to lenses like f2.8 zooms and even the Sigma f1.8 zoom (that was announced at a pretty similar time). And it seemed that there were some issues with bad copies initially. In addition, the launch price was pretty steep for what it was.
That said, it really feels like this is the sort of lens that fits really well with the DA limited ethos. If you want small lenses that are sharp wide open, but don't feature the fastest apertures, than Pentax has a line up that works well. If you want a 16-50 f2.8 zoom and don't care about size, then you should look elsewhere.
I like the photos I've seen from it, but I own a 16-50 and have been decently satisfied with it.