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 Fujifilm X-A2 and Nikon S5100 side-by-side from the front, back and top in their relative dimensions. Fujifilm X-A2 has external dimensions of 117 x 67 x 40 mm (4.61 x 2.64 x 1.57″) and weighs 350 g (0.77 lb / 12.35 oz) (including batteries). Nikon S5100 has external dimensions of 97 x 57 x 22 mm (3.82 x 2.24 x 0.87″) and weighs 132 g (0.29 lb / 4.66 oz) (including batteries).
Below you can see the front-view size comparison of the Fujifilm X-A2 and the Nikon S5100. Nikon S5100 is clearly the smaller of the two cameras. Its body is 20mm narrower, 10mm shorter and 18mm thinner than Fujifilm X-A2. As you can tell, actually this is not a fair size comparison since Nikon S5100 has a built-in lens but Fujifilm X-A2 doesn't. Once you put a lens on X-A2, its thickness will increase significantly.
Here is the back view size comparison of the Fujifilm X-A2 and Nikon S5100.
Now lets look at the top view comparison of Fujifilm X-A2 and Nikon S5100.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon S5100 is significantly lighter (218g ) than the Fujifilm X-A2 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 X-A2, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Fujifilm X-A2 nor Nikon Coolpix S5100 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
Fujifilm X-A2's 3.00" LCD screen is slightly larger than Nikon S5100's 2.7 screen.
In addition to the size advantage, Fujifilm X-A2 LCD screen also has a
Tilting feature where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels. On the other hand, Nikon S5100 has a fixed type screen which provides less flexibility in shooting positions compared to X-A2.