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 A7 III 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 A7 III has external dimensions of 127 x 96 x 74 mm (5 x 3.78 x 2.91″) and weighs 650 g (1.43 lb / 22.93 oz) (including batteries).
Below you can see the front view size comparison of Canon G1 X III and Sony A7 III. Canon G1 X III is clearly the smaller of the two cameras. Its body is 12mm narrower, 18mm shorter and 23mm thinner than Sony A7 III. As you can tell, actually this is not a fair size comparison since Canon G1 X III has a built-in lens but Sony A7 III doesn't. Once you put a lens on A7 III, its thickness will increase significantly.
Here is the back view size comparison of Canon G1 X III and Sony A7 III.
Now lets look at the top view comparison of Canon G1 X III and Sony A7 III.
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 significantly lighter (251g ) than the Sony A7 III 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 A7 III, the total kit will weigh much higher.
Both G1 X III and A7 III have weather sealings in their body, making them resistant to water and dust.
LCD Screen Size and Features
Canon G1 X III and Sony A7 III's LCD screens has the same diagonal size of 3".
Sony A7 III features a Tilting only screen
which is mostly only good for shooting from waist or over the head levels. On the other hand, Canon G1 X III sports a Fully Articulated screen
which is more flexible and useful especially for taking Selfie shots and video.