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 Fujifilm S8100fd and Pentax MX-1 side-by-side from the front, back and top in their relative dimensions. Fujifilm S8100fd has external dimensions of 111 x 78 x 79 mm (4.38 x 3.08 x 3.12″) and weighs 405 g (0.89 lb / 14.29 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 Fujifilm S8100fd and Pentax MX-1. Pentax MX-1 is 17mm shorter and 28mm thinner than Fujifilm S8100fd but it is also 11mm wider.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Pentax MX-1 is 14g lighter than the Fujifilm S8100fd but we don't think this will make a significant difference.
Unfortunately neither Fujifilm FinePix S8100fd 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
Pentax MX-1's 3" LCD screen is slightly larger than Fujifilm S8100fd's 2.5" screen.
In addition to the size advantage, Pentax MX-1 LCD screen also has a Tilting feature
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels. On the other hand, Fujifilm S8100fd has a fixed type screen which provides less flexibility in shooting positions compared to MX-1.