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 SZ-15 and Olympus E-M10 side-by-side from the front, back and top in their relative dimensions. Olympus SZ-15 has external dimensions of and weighs 250 g (0.55 lb / 8.82 oz) (including batteries). Olympus E-M10 has external dimensions of 119 x 82 x 46 mm (4.69 x 3.24 x 1.81″) and weighs 396 g (0.87 lb / 13.97 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus SZ-15 and the Olympus E-M10. Olympus SZ-15 is clearly the smaller of the two cameras. Its body is 11mm narrower, 12mm shorter and 6mm thinner than Olympus E-M10. As you can tell, actually this is not a fair size comparison since Olympus SZ-15 has a built-in lens but Olympus E-M10 doesn't. Once you put a lens on E-M10, its thickness will increase significantly.
Here is the back view size comparison of the Olympus SZ-15 and Olympus E-M10.
Now lets look at the top view comparison of Olympus SZ-15 and Olympus E-M10.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Olympus SZ-15 is significantly lighter (146g ) than the Olympus E-M10 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-M10, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Olympus SZ-15 nor Olympus OM-D E-M10 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 SZ-15 and Olympus E-M10's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Olympus E-M10 features a
Tilting screen where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels whereas the Olympus SZ-15 has a fixed type screen which provides less flexibility in shooting positions compared to E-M10.