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 XG-1 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 XG-1 has external dimensions of 119 x 89 x 98 mm (4.69 x 3.5 x 3.84″) and weighs 567 g (1.25 lb / 20.00 oz) (including batteries).
Below you can see the front-view size comparison of the Canon S120 and the Pentax XG-1. Canon S120 is clearly the smaller of the two cameras. Its body is 19mm narrower, 30mm shorter and 69mm thinner than Pentax XG-1.
Here is the back view size comparison of the Canon S120 and Pentax XG-1.
Now lets look at the top view comparison of Canon S120 and Pentax XG-1.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon S120 is significantly lighter (350g ) than the Pentax XG-1 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Canon PowerShot S120 nor Pentax XG-1 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 Top Bridge Cameras with Weather Sealing
LCD Screen Size and Features
Canon S120 and Pentax XG-1'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.