Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Nikon D5 and Pentax KP side-by-side from the front, back and top in their relative dimensions. Nikon D5 has external dimensions of 160 x 158.5 x 92 mm (6.3 x 6.2 x 3.62″) and weighs 1415 g (3.12 lb / 49.91 oz) (including batteries). 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).
Below you can see the front-view size comparison of the Nikon D5 and the Pentax KP. Pentax KP is clearly the smaller of the two cameras. Its body is 28mm narrower, 58mm shorter and 16mm thinner than Nikon D5.
Here is the back view size comparison of the Nikon D5 and Pentax KP.
Now lets look at the top view comparison of Nikon D5 and Pentax KP.
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 (712g ) than the Nikon D5 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 also have to take into account the lenses that you will be using with these bodies. Since Nikon D5 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 Nikon D5 lenses.
Weather Sealing
Both the D5 and the KP have weather sealings in their bodies, making them resistant to water and dust.
LCD Screen Size and Features
Nikon D5's 3.20" LCD screen is slightly larger than Pentax KP's 3 screen.