Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Nikon P500 and Panasonic GX7 side-by-side from the front, back and top in their relative dimensions. Nikon P500 has external dimensions of 116 x 84 x 10 mm (4.57 x 3.31 x 4.06″) and weighs 494 g (1.09 lb / 17.43 oz) (including batteries). Panasonic GX7 has external dimensions of 123 x 71 x 55 mm (4.83 x 2.78 x 2.15″) and weighs 402 g (0.89 lb / 14.18 oz) (including batteries).
Below you can see the front view size comparison of Nikon P500 and Panasonic GX7. Panasonic GX7 is 13mm shorter and 48mm thinner than Nikon P500 but it is also 7mm wider. As you can tell, actually this is not a fair size comparison since Nikon P500 has a built-in lens but Panasonic GX7 doesn't. Once you put a lens on GX7, its thickness will increase significantly.
Here is the back view size comparison of Nikon P500 and Panasonic GX7.
Now lets look at the top view comparison of Nikon P500 and Panasonic GX7.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic GX7 is significantly lighter (92g ) than the Nikon P500 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 GX7, the total kit will weigh much higher.
Unfortunately neither Nikon Coolpix P500 nor Panasonic Lumix DMC-GX7 provides any type of weather sealing in their body, 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 Bridge Cameras with Weather Sealing Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Nikon P500 and Panasonic GX7's LCD screens has the same diagonal size of 3".
Both cameras feature Tilting screens
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels.