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 Panasonic ZS40 and Sony TX55 side-by-side from the front, back and top in their relative dimensions. 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). Sony TX55 has external dimensions of 93 x 54 x 13 mm (3.66 x 2.13 x 0.51″) and weighs 109 g (0.24 lb / 3.84 oz) (including batteries).
Below you can see the front-view size comparison of the Panasonic ZS40 and the Sony TX55. Sony TX55 is clearly the smaller of the two cameras. Its body is 18mm narrower, 10mm shorter and 21mm thinner than Panasonic ZS40.
Here is the back view size comparison of the Panasonic ZS40 and Sony TX55.
Now lets look at the top view comparison of Panasonic ZS40 and Sony TX55.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony TX55 is significantly lighter (131g ) than the Panasonic ZS40 which may become a big advantage especially on long walking trips.
Weather Sealing
Unfortunately neither the Panasonic Lumix DMC-ZS40 (Lumix DMC-TZ60) nor Sony Cyber-shot DSC-TX55 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 TX55's 3.30" LCD screen is slightly larger than Panasonic ZS40's 3" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.