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 Sony TX30 and Panasonic GX8 side-by-side from the front, back and top in their relative dimensions. Sony TX30 has external dimensions of and weighs 141 g (including batteries). Panasonic GX8 has external dimensions of 133 x 78 x 63 mm (5.24 x 3.07 x 2.48″) and weighs 487 g (1.07 lb / 17.18 oz) (including batteries).
Below you can see the front-view size comparison of the Sony TX30 and the Panasonic GX8. Sony TX30 is clearly the smaller of the two cameras. Its body is 37mm narrower, 19mm shorter and 48mm thinner than Panasonic GX8. As you can tell, actually this is not a fair size comparison since Sony TX30 has a built-in lens but Panasonic GX8 doesn't. Once you put a lens on GX8, its thickness will increase significantly.
Here is the back view size comparison of the Sony TX30 and Panasonic GX8.
Now lets look at the top view comparison of Sony TX30 and Panasonic GX8.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony TX30 is significantly lighter (346g ) than the Panasonic GX8 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 GX8, the total kit will weigh much higher.
Weather Sealing
Both the TX30 and the GX8 have weather sealings in their bodies, making them resistant to water and dust.
LCD Screen Size and Features
Sony TX30's 3.30" LCD screen is slightly larger than Panasonic GX8's 3" screen.