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 IV and Pentax VS20 side-by-side from the front, back and top in their relative dimensions. 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). Pentax VS20 has external dimensions of 111 x 61 x 38 mm (4.37 x 2.4 x 1.5″) and weighs 235 g (0.52 lb / 8.29 oz) (including batteries).
Below you can see the front-view size comparison of the Sony RX100 IV and the Pentax VS20. Sony RX100 IV is 9mm narrower and 3mm shorter than Pentax VS20 but it is also 3mm thicker.
Here is the back view size comparison of the Sony RX100 IV and Pentax VS20.
Now lets look at the top view comparison of Sony RX100 IV and Pentax VS20.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax VS20 is significantly lighter (63g ) than the Sony RX100 IV which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Sony Cyber-shot DSC-RX100 IV nor Pentax Optio VS20 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 IV and Pentax VS20's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Sony RX100 IV features a
Tilting screen where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels whereas the Pentax VS20 has a fixed type screen which provides less flexibility in shooting positions compared to RX100 IV.