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 RX100 III and Sony RX100 IV side-by-side from the front, back and top in their relative dimensions. Sony RX100 III has external dimensions of 102 x 58 x 41 mm (4.02 x 2.28 x 1.61″) and weighs 290 g (0.64 lb / 10.23 oz) (including batteries). Sony RX100 IV has external dimensions of 102 x 58 x 41 mm (4.02 x 2.28 x 1.61″) and weighs 298 g (0.66 lb / 10.51 oz) (including batteries).
Below you can see the front-view size comparison of the Sony RX100 III and the Sony RX100 IV. In this case, we can see that Sony RX100 III and Sony RX100 IV have the exact same height, width and thickness.
Here is the back view size comparison of the Sony RX100 III and Sony RX100 IV.
Now lets look at the top view comparison of Sony RX100 III and Sony RX100 IV.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony RX100 III is 8g lighter than the Sony RX100 IV but we don't think this will make a significant difference.
Unfortunately neither the Sony Cyber-shot DSC-RX100 III nor Sony Cyber-shot DSC-RX100 IV provides any type of weather sealing in their bodies, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Sony RX100 III and Sony RX100 IV's LCD screens have the same diagonal size of 3.00 inches.
Both cameras feature Tilting screens
where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels.