Seriously afflicted with a cheap form of LBA as soon as I acquired my K-01, I've since bought a bunch of cheapo 28mm's from evilbay, which then add up to some real money that might have better gone to something like DA 21
Manual lenses are great on the K-01, whenever I can clearly see the LCD. And I really love 28mm - very versatile. I find this Rokinon 28mm f2.8 very sharp and has nice color. It might have a bit more distortion than usual, but I haven't shot any brick wall to really find out. Here're a couple shots from Benicia, CA with it, processed in Lightroom.