Check this review from Dp reveiw

http://www.dpreview.com/news/2055527036/pentax-k-1-s-pixel-shift-challenges-medium-format-dynamic-range?utm_campaign=internal-link&utm_source=related-news&utm_medium=text&ref=related-news&utm_expid=20106105-1.lXsXJU8CT2i23Ibvc1h0tg.0&utm_referrer=http%3A%2F%2Fwww.dpreview.com%2Freviews%2Fpentax-k-1