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 FujiFilm JX350 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). FujiFilm JX350 has external dimensions of 94 x 56 x 24 mm (3.7 x 2.2 x 0.94″) and weighs 130 g (0.29 lb / 4.59 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon 1 J4 and the FujiFilm JX350. FujiFilm JX350 is clearly the smaller of the two cameras. Its body is 6mm narrower, 4mm shorter and 5mm thinner than Nikon 1 J4. As you can tell, actually this is not a fair size comparison since FujiFilm JX350 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 FujiFilm JX350.
Now lets look at the top view comparison of Nikon 1 J4 and FujiFilm JX350.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
FujiFilm JX350 is significantly lighter (102g ) 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 FujiFilm FinePix JX350 (FinePix JX355) 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 FujiFilm JX350's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.