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 Panasonic G9 and Sony TX20 side-by-side from the front, back and top in their relative dimensions. Panasonic G9 has external dimensions of 137 x 97 x 92 mm (5.39 x 3.82 x 3.62″) and weighs 658 g (1.45 lb / 23.21 oz) (including batteries). Sony TX20 has external dimensions of 96 x 56 x 18 mm (3.78 x 2.2 x 0.71″) and weighs 133 g (0.29 lb / 4.69 oz) (including batteries).
Below you can see the front-view size comparison of the Panasonic G9 and the Sony TX20. Sony TX20 is clearly the smaller of the two cameras. Its body is 41mm narrower, 41mm shorter and 74mm thinner than Panasonic G9. As you can tell, actually this is not a fair size comparison since Sony TX20 has a built-in lens but Panasonic G9 doesn't. Once you put a lens on G9, its thickness will increase significantly.
Here is the back view size comparison of the Panasonic G9 and Sony TX20.
Now lets look at the top view comparison of Panasonic G9 and Sony TX20.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony TX20 is significantly lighter (525g ) than the Panasonic G9 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 G9, the total kit will weigh much higher.
Both the G9 and the TX20 have weather sealings in their bodies, making them resistant to water and dust.
LCD Screen Size and Features
Panasonic G9 and Sony TX20's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Panasonic G9 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 TX20's LCD screen is a fixed type which provides almost no flexibility in shooting positions compared to G9.