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 Nikon 1 J4 and Casio EX-H20G side-by-side from the front, back and top in their relative dimensions. Nikon 1 J4 has external dimensions of 100 x 60 x 29 mm (3.92 x 2.36 x 1.12″) and weighs 232 g (0.51 lb / 8.18 oz) (including batteries). Casio EX-H20G has external dimensions of 103 x 68 x 29 mm (4.06 x 2.68 x 1.14″) and weighs 216 g (0.48 lb / 7.62 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon 1 J4 and the Casio EX-H20G. As you can tell, actually this is not a fair size comparison since Casio EX-H20G has a built-in lens but Nikon 1 J4 doesn't. Once you put a lens on 1 J4, its thickness will increase significantly.
Here is the back view size comparison of the Nikon 1 J4 and Casio EX-H20G.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Casio EX-H20G is 16g lighter than the Nikon 1 J4 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 1 J4, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Nikon 1 J4 nor Casio Exilim EX-H20G 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 Mirrorless Cameras with Weather Sealing Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Nikon 1 J4 and Casio EX-H20G's LCD screens have the same diagonal size of 3.00 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.