The K3 is showing some version 1.0 bugs, including outright destruction of five images, locking up occasionally, and an irksome behavior which requires reformatting the memory card (“card is not formatted”): if one renames folders for downloading to laptop, and leaves them there as backups (as I always do with all my cameras while traveling), the camera has a fit and will not operate unless the card is formatted. Which wipes out everything on the card. No other camera I’ve used has ever behaved this stupidly. So I’m dealing with it, but it is more than a nuisance; it wipes out the data redundancy I’ve come to enjoy in the field. Maybe Pentax will fix it, because there is zero reason for it other than it being a bug.
As far as usability, several operational aspects of the K3 are time-wasting bad design (with no workaround, I have read the entire manual and gone through all settings). And there are some behaviors that make the camera feel “busy”—it does certain distracting things that are not observed with other DSLRs—it feels arbitrary and puzzling at the least. And then there is troublesome backfocus with the 70/2.4 (autofocus and carefully placed spot focus too) which would have entirely ruined a rare opportunity with a wood duck at dawn, though on the fly AF Fine Adjustment yielded one good image before the duck flew away. Given the excellent operational design of its cousin-camera, the Ricoh GR, the K3 design is a baffling regression to consumer-grade behavior. I’ll be detailing the issues in my review.
As far as the five Pentax HD Limited prime lenses, I am forming some strong impressions, some very good and some less good. I have a range of material from all five of them now and I’ll be steadily documenting each lens when I return, which should be helpful in buying considerations. That work to be interleaved with all the other brands and lenses I also have to write up.