Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Nikon L31 and Samsung GX-20 side-by-side from the front, back and top in their relative dimensions. Nikon L31 has external dimensions of 96 x 59 x 29 mm (3.78 x 2.32 x 1.14″) and weighs 160 g (0.35 lb / 5.64 oz) (including batteries). Samsung GX-20 has external dimensions of 142 x 101 x 72 mm (5.59 x 3.98 x 2.83″) and weighs 800 g (1.76 lb / 28.22 oz) (including batteries).
Below you can see the front view size comparison of Nikon L31 and Samsung GX-20. Nikon L31 is clearly the smaller of the two cameras. Its body is 46mm narrower, 42mm shorter and 43mm thinner than Samsung GX-20. As you can tell, actually this is not a fair size comparison since Nikon L31 has a built-in lens but Samsung GX-20 doesn't. Once you put a lens on GX-20, its thickness will increase significantly.
Here is the back view size comparison of Nikon L31 and Samsung GX-20.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon L31 is significantly lighter (640g ) than the Samsung GX-20 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 GX-20, the total kit will weigh much higher.
Thanks to the weather sealed body of GX-20, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to L31.
LCD Screen Size and Features
Nikon L31 and Samsung GX-20's LCD screens has the same diagonal size of 2.70".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.