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 Canon G1 X III and Sony a3500 side-by-side from the front, back and top in their relative dimensions. Canon G1 X III has external dimensions of 115 x 78 x 51 mm (4.53 x 3.07 x 2.01″) and weighs 399 g (0.88 lb / 14.07 oz) (including batteries). Sony a3500 has external dimensions of 128 x 91 x 85 mm (5.04 x 3.58 x 3.35″) and weighs 411 g (0.91 lb / 14.50 oz) (including batteries).
Below you can see the front view size comparison of Canon G1 X III and Sony a3500. Canon G1 X III is clearly the smaller of the two cameras. Its body is 13mm narrower, 13mm shorter and 34mm thinner than Sony a3500. As you can tell, actually this is not a fair size comparison since Canon G1 X III has a built-in lens but Sony a3500 doesn't. Once you put a lens on a3500, its thickness will increase significantly.
Now lets look at the top view comparison of Canon G1 X III and Sony a3500.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon G1 X III is 12g lighter than the Sony a3500 but we don't think this will make a significant difference.
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 a3500, the total kit will weigh much higher.
With its weather sealed body, we believe that G1 X III has a big advantage over a3500 which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Canon G1 X III and Sony a3500's LCD screens has the same diagonal size of 3".
On the other hand, Canon G1 X III sports a Fully Articulated screen
which you can change the angle and position of the screen almost freely, making it possible to shoot from waist or over the head levels, and especially very useful for shooting selfies and video. Sony a3500's LCD screen is a fixed type which provides almost no flexibility in shooting positions compared to G1 X III.