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-M5 II and Nikon P520 side-by-side from the front, back and top in their relative dimensions. Olympus E-M5 II has external dimensions of 124 x 85 x 45 mm (4.88 x 3.35 x 1.77″) and weighs 469 g (1.03 lb / 16.54 oz) (including batteries). Nikon P520 has external dimensions of 125 x 84 x 102 mm (4.92 x 3.31 x 4.02″) and weighs 550 g (1.21 lb / 19.40 oz) (including batteries).
Below you can see the front-view size comparison of the Olympus E-M5 II and the Nikon P520. Olympus E-M5 II is 1mm narrower and 57mm thinner than Nikon P520 but it is also 1mm taller. As you can tell, actually this is not a fair size comparison since Nikon P520 has a built-in lens but Olympus E-M5 II doesn't. Once you put a lens on E-M5 Mark II, its thickness will increase significantly.
Here is the back view size comparison of the Olympus E-M5 II and Nikon P520.
Now lets look at the top view comparison of Olympus E-M5 II and Nikon P520.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Olympus E-M5 II is significantly lighter (81g ) than the Nikon P520 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-M5 Mark II, the total kit will weigh much higher.
Weather Sealing
With its weather-sealed body, we believe that the E-M5 Mark II has a big advantage over the P520 which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Nikon P520's 3.20" LCD screen is slightly larger than Olympus E-M5 II's 3 screen.