The Pentax K-1 is outwardly quite similar to the K-3 II camera, but it's both bigger - 110(H) x 136.5(W) x 85.5(D) - and much heavier, weighing in at 1010g without the battery or memory card fitted, ...
The Pentax K-1 Mark II is virtually identical to the original K-1 model, so if you don't know anything about that camera, we strongly suggest that you head over and read our in-depth Pentax K-1 review ...