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 Olympus E-M10 IV and Panasonic G100 side-by-side from the front, back and top in their relative dimensions. Olympus E-M10 IV has external dimensions of 122 x 84 x 49 mm (4.8 x 3.31 x 1.93″) and weighs 383 g (0.84 lb / 13.51 oz) (including batteries). Panasonic G100 has external dimensions of 116 x 83 x 54 mm (4.57 x 3.27 x 2.13″) and weighs 352 g (0.78 lb / 12.42 oz) (including batteries).
Below you can see the front view size comparison of Olympus E-M10 IV and Panasonic G100. Panasonic G100 is 6mm narrower and 1mm shorter than Olympus E-M10 IV but it is also 5mm thicker.
Here is the back view size comparison of Olympus E-M10 IV and Panasonic G100.
Now lets look at the top view comparison of Olympus E-M10 IV and Panasonic G100.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic G100 is 31g lighter than the Olympus E-M10 IV 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 have to also take into account the lenses that you will be using with these bodies. Since both Olympus E-M10 IV and Panasonic G100 have the same Micro Four Thirds lens mount and Four Thirds sized sensors, lenses will not be a differentiator on total size of the system.
Unfortunately neither Olympus OM-D E-M10 IV nor Panasonic Lumix DC-G100 provides any type of weather sealing in their body, 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
Olympus E-M10 IV and Panasonic G100's LCD screens has the same diagonal size of 3".
Olympus E-M10 IV features a Tilting only screen
which is mostly only good for shooting from waist or over the head levels. On the other hand, Panasonic G100 sports a Fully Articulated screen
which is more flexible and useful especially for taking Selfie shots and video.