A couple of years ago, at the start of 2016, Ricoh finally answered the calls from Pentaxians for a full-frame DSLR with the arrival of the Pentax K-1. We were seriously impressed by the weatherproof, 36-megapixel K-1, which paired great ergonomics with a lengthy laundry list of features, some of them completely unique to this camera.

The first full-frame Pentax with an accelerator unit, as seen previously in the sub-frame K-70 and KP

Two years down the line, the K-1 has now received a followup in the form of the Pentax K-1 II. If you’re familiar with the earlier camera, you already know most of what you need to about its successor, as the two are near-identical in most ways. There are changes in just a few key areas.
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https://www.imaging-resource.com/PRODS/pentax-k1-ii/pentax-k1-iiA.HTM