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 Fujifilm X10 and Pentax S1 side-by-side from the front, back and top in their relative dimensions. Fujifilm X10 has external dimensions of 117 x 70 x 57 mm (4.61 x 2.76 x 2.24″) and weighs 350 g (0.77 lb / 12.35 oz) (including batteries). Pentax S1 has external dimensions of 114 x 58 x 28 mm (4.49 x 2.28 x 1.1″) and weighs 157 g (0.35 lb / 5.54 oz) (including batteries).
Below you can see the front-view size comparison of the Fujifilm X10 and the Pentax S1. Pentax S1 is clearly the smaller of the two cameras. Its body is 3mm narrower, 12mm shorter and 29mm thinner than Fujifilm X10.
Here is the back view size comparison of the Fujifilm X10 and Pentax S1.
Now lets look at the top view comparison of Fujifilm X10 and Pentax S1.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Pentax S1 is significantly lighter (193g ) than the Fujifilm X10 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Fujifilm X10 nor Pentax Optio S1 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
Fujifilm X10's 2.80" LCD screen is slightly larger than Pentax S1's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.