Two experienced Pentax users at a Chinese Pentax forum reported (here, here and here) that the new firmwares have improved the AF performance and accuracy of their K-1 and K-1 II cameras a lot for their many different Pentax lenses and the difference has been obvious and significant.
Should this again be a hypothesis made owing to psychological effect? I would later on test myself to see if there is really any improvement as claimed. I believe that "measurbation" does help and will tell. Stay tuned. ;-)