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 TX100V 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 TX100V has external dimensions of 97 x 59 x 18 mm (3.82 x 2.32 x 0.71″) and weighs 147 g (0.32 lb / 5.19 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon 1 J4 and the Sony TX100V. Sony TX100V is clearly the smaller of the two cameras. Its body is 3mm narrower, 1mm shorter and 11mm thinner than Nikon 1 J4. As you can tell, actually this is not a fair size comparison since Sony TX100V 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 TX100V.
Now lets look at the top view comparison of Nikon 1 J4 and Sony TX100V.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony TX100V is significantly lighter (85g ) 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-TX100V 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
Sony TX100V's 3.50" 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.