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 Olympus FE-4000 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). Olympus FE-4000 has external dimensions of 95 x 57 x 22 mm (3.74 x 2.24 x 0.87″) and weighs 136 g (0.30 lb / 4.80 oz) (including batteries).
Below you can see the front view size comparison of Panasonic ZS1 and Olympus FE-4000. Olympus FE-4000 is clearly the smaller of the two cameras. Its body is 8mm narrower, 3mm shorter and 11mm thinner than Panasonic ZS1.
Here is the back view size comparison of Panasonic ZS1 and Olympus FE-4000.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Olympus FE-4000 is significantly lighter (93g ) 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 Olympus FE-4000 (X-925) 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 Olympus FE-4000'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.