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 Canon G1 X III and Pentax KP side-by-side from the front, back and top in their relative dimensions. Canon G1 X III has external dimensions of 115 x 78 x 51 mm (4.53 x 3.07 x 2.01″) and weighs 399 g (0.88 lb / 14.07 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 Canon G1 X III and Pentax KP. Canon G1 X III is clearly the smaller of the two cameras. Its body is 17mm narrower, 23mm shorter and 25mm thinner than Pentax KP. As you can tell, actually this is not a fair size comparison since Canon G1 X III has a built-in lens but Pentax KP doesn't. Once you put a lens on KP, its thickness will increase significantly.
Here is the back view size comparison of Canon G1 X III and Pentax KP.
Now lets look at the top view comparison of Canon G1 X III and Pentax KP.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon G1 X III is significantly lighter (304g ) than the Pentax KP which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on KP, the total kit will weigh much higher.
Both G1 X III and KP have weather sealings in their body, making them resistant to water and dust.
LCD Screen Size and Features
Canon G1 X III and Pentax KP's LCD screens has the same diagonal size of 3".
Pentax KP features a Tilting only screen
which is mostly only good for shooting from waist or over the head levels. On the other hand, Canon G1 X III sports a Fully Articulated screen
which is more flexible and useful especially for taking Selfie shots and video.