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 Olympus SH-3 and Olympus E-PM1 side-by-side from the front, back and top in their relative dimensions. Olympus SH-3 has external dimensions of 109 x 63 x 42 mm (4.29 x 2.48 x 1.65″) and weighs 271 g (0.60 lb / 9.56 oz) (including batteries). Olympus E-PM1 has external dimensions of 110 x 64 x 34 mm (4.33 x 2.52 x 1.34″) and weighs 265 g (0.58 lb / 9.35 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus SH-3 and the Olympus E-PM1. Olympus SH-3 is 1mm narrower and 1mm shorter than Olympus E-PM1 but it is also 8mm thicker. As you can tell, actually this is not a fair size comparison since Olympus SH-3 has a built-in lens but Olympus E-PM1 doesn't. Once you put a lens on E-PM1, its thickness will increase significantly.
Here is the back view size comparison of the Olympus SH-3 and Olympus E-PM1.
Now lets look at the top view comparison of Olympus SH-3 and Olympus E-PM1.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Olympus E-PM1 is 6g lighter than the Olympus SH-3 but we don't think this will make a significant difference.
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-PM1, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Olympus Stylus SH-3 nor Olympus PEN E-PM1 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
Olympus SH-3 and Olympus E-PM1's LCD screens have the same diagonal size of 3.00 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.