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 Panasonic ZS1 and Sony W620 side-by-side from the front, back and top in their relative dimensions. Panasonic ZS1 has external dimensions of 103 x 60 x 33 mm (4.06 x 2.36 x 1.3″) and weighs 229 g (0.50 lb / 8.08 oz) (including batteries). Sony W620 has external dimensions of 98 x 56 x 20 mm (3.86 x 2.2 x 0.79″) and weighs 116 g (0.26 lb / 4.09 oz) (including batteries).
Below you can see the front view size comparison of Panasonic ZS1 and Sony W620. Sony W620 is clearly the smaller of the two cameras. Its body is 5mm narrower, 4mm shorter and 13mm thinner than Panasonic ZS1.
Here is the back view size comparison of Panasonic ZS1 and Sony W620.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Sony W620 is significantly lighter (113g ) than the Panasonic ZS1 which may become a big advantage especially on long walking trips.
Unfortunately neither Panasonic Lumix DMC-ZS1 (Lumix DMC-TZ6) nor Sony Cyber-shot DSC-W620 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 Compact Cameras with Weather Sealing
LCD Screen Size and Features
Panasonic ZS1 and Sony W620's LCD screens has the same diagonal size of 2.7".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.