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 Sony HX300 and Olympus E-M10 III side-by-side from the front, back and top in their relative dimensions. Sony HX300 has external dimensions of 130 x 93 x 103 mm (5.1 x 3.67 x 4.06″) and weighs 623 g (including batteries). Olympus E-M10 III has external dimensions of 122 x 84 x 50 mm (4.8 x 3.31 x 1.97″) and weighs 410 g (0.90 lb / 14.46 oz) (including batteries).
Below you can see the front-view size comparison of the Sony HX300 and the Olympus E-M10 III. Olympus E-M10 III is clearly the smaller of the two cameras. Its body is 8mm narrower, 9mm shorter and 53mm thinner than Sony HX300. As you can tell, actually this is not a fair size comparison since Sony HX300 has a built-in lens but Olympus E-M10 III doesn't. Once you put a lens on E-M10 III, its thickness will increase significantly.
Here is the back view size comparison of the Sony HX300 and Olympus E-M10 III.
Now lets look at the top view comparison of Sony HX300 and Olympus E-M10 III.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Olympus E-M10 III is significantly lighter (213g ) than the Sony HX300 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 E-M10 III, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Sony Cyber-shot DSC-HX300 nor Olympus OM-D E-M10 Mark III 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 Bridge Cameras with Weather Sealing Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Sony HX300 and Olympus E-M10 III's LCD screens have the same diagonal size of 3.00 inches.
Both cameras feature
Tilting screens where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels.