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 Samsung NX100 and Pentax WG-2 GPS side-by-side from the front, back and top in their relative dimensions. Samsung NX100 has external dimensions of 120 x 71 x 35 mm (4.72 x 2.8 x 1.38″) and weighs 282 g (0.62 lb / 9.95 oz) (including batteries). Pentax WG-2 GPS has external dimensions of 122 x 61 x 30 mm (4.8 x 2.4 x 1.18″) and weighs 198 g (0.44 lb / 6.98 oz) (including batteries).
Below you can see the front view size comparison of Samsung NX100 and Pentax WG-2 GPS. Pentax WG-2 GPS is 10mm shorter and 5mm thinner than Samsung NX100 but it is also 2mm wider. As you can tell, actually this is not a fair size comparison since Pentax WG-2 GPS has a built-in lens but Samsung NX100 doesn't. Once you put a lens on NX100, its thickness will increase significantly.
Now lets look at the top view comparison of Samsung NX100 and Pentax WG-2 GPS.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Pentax WG-2 GPS is significantly lighter (84g ) than the Samsung NX100 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 NX100, the total kit will weigh much higher.
LCD Screen Size and Features
Samsung NX100 and Pentax WG-2 GPS'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.