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 Canon S120 and Pentax VS20 side-by-side from the front, back and top in their relative dimensions. Canon S120 has external dimensions of 100 x 59 x 29 mm (3.94 x 2.32 x 1.14″) and weighs 217 g (0.48 lb / 7.65 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 Canon S120 and the Pentax VS20. Canon S120 is clearly the smaller of the two cameras. Its body is 11mm narrower, 2mm shorter and 9mm thinner than Pentax VS20.
Here is the back view size comparison of the Canon S120 and Pentax VS20.
Now lets look at the top view comparison of Canon S120 and Pentax VS20.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon S120 is 18g lighter than the Pentax VS20 but we don't think this will make a significant difference.
Weather Sealing
Unfortunately neither the Canon PowerShot S120 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
Canon S120 and Pentax VS20's LCD screens have the same diagonal size of 3.00 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.