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 Nikon S9100 and Fujifilm X-Pro1 side-by-side from the front, back and top in their relative dimensions. Nikon S9100 has external dimensions of 105 x 62 x 35 mm (4.13 x 2.44 x 1.38″) and weighs 214 g (0.47 lb / 7.55 oz) (including batteries). Fujifilm X-Pro1 has external dimensions of 140 x 82 x 43 mm (5.51 x 3.23 x 1.69″) and weighs 450 g (0.99 lb / 15.87 oz) (including batteries).
Below you can see the front view size comparison of Nikon S9100 and Fujifilm X-Pro1. Nikon S9100 is clearly the smaller of the two cameras. Its body is 35mm narrower, 20mm shorter and 8mm thinner than Fujifilm X-Pro1. As you can tell, actually this is not a fair size comparison since Nikon S9100 has a built-in lens but Fujifilm X-Pro1 doesn't. Once you put a lens on X-Pro1, its thickness will increase significantly.
Comparison image of Nikon S9100 and Fujifilm X-Pro1 Size, Weight and External Dimensions - Front View
Here is the back view size comparison of Nikon S9100 and Fujifilm X-Pro1.
Comparison image of Nikon S9100 and Fujifilm X-Pro1 Size and Weight - Back View
Now lets look at the top view comparison of Nikon S9100 and Fujifilm X-Pro1.
Top View Comparison image of Nikon S9100 and Fujifilm X-Pro1 Size
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon S9100 is significantly lighter (236g ) than the Fujifilm X-Pro1 which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on X-Pro1, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither Nikon Coolpix S9100 nor Fujifilm X-Pro1 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 Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Nikon S9100 and Fujifilm X-Pro1's LCD screens has the same diagonal size of 3".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.