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 Nikon D4s 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). Nikon D4s has external dimensions of 160 x 157 x 91 mm (6.3 x 6.18 x 3.58″) and weighs 1350 g (2.98 lb / 47.62 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon 1 J4 and the Nikon D4s. Nikon 1 J4 is clearly the smaller of the two cameras. Its body is 60mm narrower, 97mm shorter and 62mm thinner than Nikon D4s.
Here is the back view size comparison of the Nikon 1 J4 and Nikon D4s.
Now lets look at the top view comparison of Nikon 1 J4 and Nikon D4s.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon 1 J4 is significantly lighter (1118g ) than the Nikon D4s which may become a big advantage especially on long walking trips.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you also have to take into account the lenses that you will be using with these bodies. Since Nikon D4s has a Full frame sensor and Nikon 1 J4 has a smaller 1' sensor, Nikon 1 J4's lenses for a similar focal length and aperture will generally be lighter and smaller than the Nikon D4s lenses.
Weather Sealing
Thanks to the weather-sealed body of the D4s, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to the 1 J4.
LCD Screen Size and Features
Nikon D4s's 3.20" LCD screen is slightly larger than Nikon 1 J4's 3" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.