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 Casio EX-100 and Olympus E-P5 side-by-side from the front, back and top in their relative dimensions. Casio EX-100 has external dimensions of 119x67x50 mm and weighs 389 g (including batteries). Olympus E-P5 has external dimensions of 122 x 69 x 37 mm (4.8 x 2.72 x 1.46″) and weighs 420 g (0.93 lb / 14.82 oz) (including batteries).
Below you can see the front-view size comparison of the Casio EX-100 and the Olympus E-P5. Casio EX-100 is 3mm narrower and 2mm shorter than Olympus E-P5 but it is also 13mm thicker. As you can tell, actually this is not a fair size comparison since Casio EX-100 has a built-in lens but Olympus E-P5 doesn't. Once you put a lens on E-P5, its thickness will increase significantly.
Here is the back view size comparison of the Casio EX-100 and Olympus E-P5.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Casio EX-100 is 31g lighter than the Olympus E-P5 but we don't think this will make a significant difference.
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-P5, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Casio Exilim EX-100 nor Olympus PEN E-P5 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 Compact Cameras with Weather Sealing Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Casio EX-100's 3.50" LCD screen is slightly larger than Olympus E-P5's 3" screen.
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.