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 Canon SX520 HS and Nikon S640 side-by-side from the front, back and top in their relative dimensions. Canon SX520 HS has external dimensions of 120 x 82 x 92 mm (4.72 x 3.23 x 3.62″) and weighs 441 g (0.97 lb / 15.56 oz) (including batteries). Nikon S640 has external dimensions of 91 x 55 x 21 mm (3.58 x 2.17 x 0.83″) and weighs 130 g (0.29 lb / 4.59 oz) (including batteries).
Below you can see the front-view size comparison of the Canon SX520 HS and the Nikon S640. Nikon S640 is clearly the smaller of the two cameras. Its body is 29mm narrower, 27mm shorter and 71mm thinner than Canon SX520 HS.
Here is the back view size comparison of the Canon SX520 HS and Nikon S640.
Now lets look at the top view comparison of Canon SX520 HS and Nikon S640.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Nikon S640 is significantly lighter (311g ) than the Canon SX520 HS which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Canon PowerShot SX520 HS nor Nikon Coolpix S640 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
LCD Screen Size and Features
Canon SX520 HS's 3.00" LCD screen is slightly larger than Nikon S640's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.