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 Sony W380 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). Sony W380 has external dimensions of 91 x 52 x 20 mm (3.58 x 2.05 x 0.79″) and weighs 117 g (0.26 lb / 4.13 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon 1 J4 and the Sony W380. Sony W380 is clearly the smaller of the two cameras. Its body is 9mm narrower, 8mm shorter and 9mm thinner than Nikon 1 J4. As you can tell, actually this is not a fair size comparison since Sony W380 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 Sony W380.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony W380 is significantly lighter (115g ) than the Nikon 1 J4 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 1 J4, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Nikon 1 J4 nor Sony Cyber-shot DSC-W380 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's 3.00" LCD screen is slightly larger than Sony W380's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.