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 E-M10 II and Panasonic FH3 side-by-side from the front, back and top in their relative dimensions. Olympus E-M10 II has external dimensions of 120 x 83 x 47 mm (4.72 x 3.27 x 1.85″) and weighs 390 g (0.86 lb / 13.76 oz) (including batteries). Panasonic FH3 has external dimensions of 98 x 55 x 24 mm (3.86 x 2.17 x 0.94″) and weighs 165 g (0.36 lb / 5.82 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus E-M10 II and the Panasonic FH3. Panasonic FH3 is clearly the smaller of the two cameras. Its body is 22mm narrower, 28mm shorter and 23mm thinner than Olympus E-M10 II. As you can tell, actually this is not a fair size comparison since Panasonic FH3 has a built-in lens but Olympus E-M10 II doesn't. Once you put a lens on E-M10 II, its thickness will increase significantly.
Here is the back view size comparison of the Olympus E-M10 II and Panasonic FH3.
Now lets look at the top view comparison of Olympus E-M10 II and Panasonic FH3.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Panasonic FH3 is significantly lighter (225g ) than the Olympus E-M10 II 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 II, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Olympus OM-D E-M10 II nor Panasonic Lumix DMC-FH3 (Lumix DMC-FS11) 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 Mirrorless Cameras with Weather Sealing Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Olympus E-M10 II's 3.00" LCD screen is slightly larger than Panasonic FH3's 2.7" screen.
In addition to the size advantage, Olympus E-M10 II LCD screen also has a
Tilting feature where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels. On the other hand, Panasonic FH3 has a fixed type screen which provides less flexibility in shooting positions compared to E-M10 II.