That's incorrect; the K-1 has the newly developed SAFOX 12 modules. It's using the same sensor as K-3's SAFOX XI, but with completely revised optics (the optical path is longer, they added a mirror for that).
In effect, "its autofocus area is approximately 40 percent wider than a conventional AF frame" (and there are 6 more AF points, and who knows what other effects not immediately seen in the specs list).
You can clearly see how it covers the APS-C frame better than the K-3:
OTOH, the only FF DSLR covering most of the crop frame is, AFAIK, the D5. The 1DxMkII should be comparable, but it doesn't support EF-S lenses.