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 Nikon D4 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). Nikon D4 has external dimensions of 160 x 157 x 91 mm (6.3 x 6.18 x 3.58″) and weighs 1340 g (2.95 lb / 47.27 oz) (including batteries).
Below you can see the front view size comparison of Nikon P500 and Nikon D4. Nikon P500 is 44mm narrower and 73mm shorter than Nikon D4 but it is also 12mm thicker. As you can tell, actually this is not a fair size comparison since Nikon P500 has a built-in lens but Nikon D4 doesn't. Once you put a lens on D4, its thickness will increase significantly.
Here is the back view size comparison of Nikon P500 and Nikon D4.
Now lets look at the top view comparison of Nikon P500 and Nikon D4.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon P500 is significantly lighter (846g ) than the Nikon D4 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 D4, the total kit will weigh much higher.
Thanks to the weather sealed body of D4, you can use this camera with more confidence under conditions where there is risk of exposure to water and dust compared to P500.
LCD Screen Size and Features
Nikon D4's 3.2" LCD screen is slightly larger than Nikon P500's 3" screen.
On the other hand, Nikon P500 LCD screen 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, Nikon D4 has a fixed type screen which provides less flexibility in shooting positions compared to P500.