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 Sony W650 and Panasonic ZS40 side-by-side from the front, back and top in their relative dimensions. Sony W650 has external dimensions of 94 x 56 x 19 mm (3.7 x 2.2 x 0.75″) and weighs 124 g (0.27 lb / 4.37 oz) (including batteries). Panasonic ZS40 has external dimensions of 111 x 64 x 34 mm (4.37 x 2.52 x 1.34″) and weighs 240 g (0.53 lb / 8.47 oz) (including batteries).
Below you can see the front-view size comparison of the Sony W650 and the Panasonic ZS40. Sony W650 is clearly the smaller of the two cameras. Its body is 17mm narrower, 8mm shorter and 15mm thinner than Panasonic ZS40.
Here is the back view size comparison of the Sony W650 and Panasonic ZS40.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony W650 is significantly lighter (116g ) than the Panasonic ZS40 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Sony Cyber-shot DSC-W650 nor Panasonic Lumix DMC-ZS40 (Lumix DMC-TZ60) 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
Sony W650 and Panasonic ZS40's LCD screens have the same diagonal size of 3.00 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.