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 Leica CL 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). Leica CL has external dimensions of 131 x 78 x 45 mm (5.16 x 3.07 x 1.77″) and weighs 403 g (0.89 lb / 14.22 oz) (including batteries).
Below you can see the front view size comparison of Olympus E-M10 IV and Leica CL. Leica CL is 6mm shorter and 4mm thinner than Olympus E-M10 IV but it is also 9mm wider.
Here is the back view size comparison of Olympus E-M10 IV and Leica CL.
Now lets look at the top view comparison of Olympus E-M10 IV and Leica CL.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Olympus E-M10 IV is 20g lighter than the Leica CL 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 Leica CL has an APS-C sized sensor and Olympus E-M10 IV has a smaller Four Thirds sensor, Olympus E-M10 IV's lenses for a similar focal length and aperture will generally be lighter and smaller than the Leica CL lenses.
Unfortunately neither Olympus OM-D E-M10 IV nor Leica CL 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 Leica CL's LCD screens has the same diagonal size of 3".
On the other hand, Olympus E-M10 IV features a Tilting screen
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels whereas the Leica CL has a fixed type screen which provides less flexibility in shooting positions compared to E-M10 IV.