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 Panasonic GM5 and Pentax Q-S1 side-by-side from the front, back and top in their relative dimensions. Panasonic GM5 has external dimensions of 99 x 60 x 36 mm (3.9 x 2.36 x 1.42″) and weighs 211 g (0.47 lb / 7.44 oz) (including batteries). Pentax Q-S1 has external dimensions of 105 x 58 x 34 mm (4.13 x 2.28 x 1.34″) and weighs 203 g (0.45 lb / 7.16 oz) (including batteries).
Below you can see the front-view size comparison of the Panasonic GM5 and the Pentax Q-S1. Pentax Q-S1 is 2mm shorter and 2mm thinner than Panasonic GM5 but it is also 6mm wider.
Here is the back view size comparison of the Panasonic GM5 and Pentax Q-S1.
Now lets look at the top view comparison of Panasonic GM5 and Pentax Q-S1.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax Q-S1 is 8g lighter than the Panasonic GM5 but we don't think this will make a significant difference.
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.
Weather Sealing
Unfortunately neither the Panasonic Lumix DMC-GM5 nor Pentax Q-S1 provides any type of weather sealing in their bodies, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Panasonic GM5 and Pentax Q-S1's LCD screens have the same diagonal size of 3.00 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.