Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Pentax KP and Canon 1D X III side-by-side from the front, back and top in their relative dimensions. Pentax KP has external dimensions of 132 x 101 x 76 mm (5.2 x 3.98 x 2.99″) and weighs 703 g (1.55 lb / 24.80 oz) (including batteries). Canon 1D X III has external dimensions of 158 x 168 x 83 mm (6.22 x 6.61 x 3.27″) and weighs 1440 g (3.17 lb / 50.79 oz) (including batteries).
Below you can see the front view size comparison of Pentax KP and Canon 1D X III. Pentax KP is clearly the smaller of the two cameras. Its body is 26mm narrower, 67mm shorter and 7mm thinner than Canon 1D X III.
Here is the back view size comparison of Pentax KP and Canon 1D X III.
Now lets look at the top view comparison of Pentax KP and Canon 1D X III.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Pentax KP is significantly lighter (737g ) than the Canon 1D X III which may become a big advantage especially on long walking trips.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you have to also take into account the lenses that you will be using with these bodies. Since Canon 1D X III has a Full frame sensor and Pentax KP has a smaller APS-C sensor, Pentax KP's lenses for a similar focal length and aperture will generally be lighter and smaller than the Canon 1D X III lenses.
Both KP and 1D X MIII have weather sealings in their body, making them resistant to water and dust.
LCD Screen Size and Features
Canon 1D X III's 3.20" LCD screen is slightly larger than Pentax KP's 3 screen.
On the other hand, Pentax KP LCD screen has a Tilting feature
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels. On the other hand, Canon 1D X III has a fixed type screen which provides less flexibility in shooting positions compared to KP.