Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Canon SX120 IS and Pentax MX-1 side-by-side from the front, back and top in their relative dimensions. Canon SX120 IS has external dimensions of 111 x 71 x 45 mm (4.37 x 2.8 x 1.77″) and weighs 285 g (0.63 lb / 10.05 oz) (including batteries). Pentax MX-1 has external dimensions of 122 x 61 x 51 mm (4.8 x 2.4 x 2.01″) and weighs 391 g (0.86 lb / 13.79 oz) (including batteries).
Below you can see the front view size comparison of Canon SX120 IS and Pentax MX-1. Canon SX120 IS is 11mm narrower and 6mm thinner than Pentax MX-1 but it is also 10mm taller.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon SX120 IS is significantly lighter (106g ) than the Pentax MX-1 which may become a big advantage especially on long walking trips.
Unfortunately neither Canon PowerShot SX120 IS nor Pentax MX-1 provides any type of weather sealing in their body, 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 SX120 IS and Pentax MX-1's LCD screens has the same diagonal size of 3".
On the other hand, Pentax MX-1 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 Canon SX120 IS has a fixed type screen which provides less flexibility in shooting positions compared to MX-1.