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 Samsung ST100 and Olympus E-PL6 side-by-side from the front, back and top in their relative dimensions. Samsung ST100 has external dimensions of 100 x 60 x 20 mm (3.94 x 2.36 x 0.79″) and weighs 155 g (0.34 lb / 5.47 oz) (including batteries). Olympus E-PL6 has external dimensions of 111 x 64 x 38 mm (4.37 x 2.52 x 1.5″) and weighs 325 g (0.72 lb / 11.46 oz) (including batteries).
Below you can see the front-view size comparison of the Samsung ST100 and the Olympus E-PL6. Samsung ST100 is clearly the smaller of the two cameras. Its body is 11mm narrower, 4mm shorter and 18mm thinner than Olympus E-PL6. As you can tell, actually this is not a fair size comparison since Samsung ST100 has a built-in lens but Olympus E-PL6 doesn't. Once you put a lens on E-PL6, its thickness will increase significantly.
Here is the back view size comparison of the Samsung ST100 and Olympus E-PL6.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Samsung ST100 is significantly lighter (170g ) than the Olympus E-PL6 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 E-PL6, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Samsung ST100 nor Olympus PEN E-PL6 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 Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Samsung ST100's 3.50" LCD screen is slightly larger than Olympus E-PL6's 3" screen.