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 A77 II 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 A77 II has external dimensions of 143 x 104 x 81 mm (5.63 x 4.09 x 3.19″) and weighs 647 g (1.43 lb / 22.82 oz) (including batteries).
Below you can see the front view size comparison of Canon G1 X III and Sony A77 II. Canon G1 X III is clearly the smaller of the two cameras. Its body is 28mm narrower, 26mm shorter and 30mm thinner than Sony A77 II. As you can tell, actually this is not a fair size comparison since Canon G1 X III has a built-in lens but Sony A77 II doesn't. Once you put a lens on A77 II, its thickness will increase significantly.
Here is the back view size comparison of Canon G1 X III and Sony A77 II.
Now lets look at the top view comparison of Canon G1 X III and Sony A77 II.
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 (248g ) than the Sony A77 II 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 A77 II, the total kit will weigh much higher.
Both G1 X III and A77 II have weather sealings in their body, making them resistant to water and dust.
LCD Screen Size and Features
Canon G1 X III and Sony A77 II's LCD screens has the same diagonal size of 3".
Both cameras feature Fully Articulating screens
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels. Fully articulating screens are also useful for taking Selfie shots and video.