http://www.optyczne.pl/5268-nowo%C5%9B%C4%87-Pentax_smc_DA_50_mm_f_1.8_-_zdj%C4%99cia_przyk%C5%82adowe.html
(in Polish)
They look rather soft and lack of contrast throughout the frame, which is even not much improved when stopped down. I am almost sure that my K-5 with an old budget A50 could do better, but I don't know why these samples suck nonetheless!