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-10 and Panasonic GH4 side-by-side from the front, back and top in their relative dimensions. Casio EX-10 has external dimensions of 120 x 68 x 49 mm (4.72 x 2.67 x 1.91″) and weighs 384 g (0.85 lb / 13.55 oz) (including batteries). Panasonic GH4 has external dimensions of 133 x 93 x 84 mm (5.24 x 3.66 x 3.31″) and weighs 560 g (1.23 lb / 19.75 oz) (including batteries).
Below you can see the front-view size comparison of the Casio EX-10 and the Panasonic GH4. Casio EX-10 is clearly the smaller of the two cameras. Its body is 13mm narrower, 25mm shorter and 35mm thinner than Panasonic GH4. As you can tell, actually this is not a fair size comparison since Casio EX-10 has a built-in lens but Panasonic GH4 doesn't. Once you put a lens on GH4, its thickness will increase significantly.
Here is the back view size comparison of the Casio EX-10 and Panasonic GH4.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Casio EX-10 is significantly lighter (176g ) than the Panasonic GH4 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 GH4, the total kit will weigh much higher.
Weather Sealing
Thanks to the weather-sealed body of the GH4, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the EX-10.
LCD Screen Size and Features
Casio EX-10's 3.50" LCD screen is slightly larger than Panasonic GH4's 3" screen.