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 ZS8 and Canon G15 side-by-side from the front, back and top in their relative dimensions. Panasonic ZS8 has external dimensions of 105 x 58 x 33 mm (4.13 x 2.28 x 1.3″) and weighs 210 g (0.46 lb / 7.41 oz) (including batteries). Canon G15 has external dimensions of 107 x 76 x 40 mm (4.21 x 2.99 x 1.57″) and weighs 352 g (0.78 lb / 12.42 oz) (including batteries).
Below you can see the front view size comparison of Panasonic ZS8 and Canon G15. Panasonic ZS8 is clearly the smaller of the two cameras. Its body is 2mm narrower, 18mm shorter and 7mm thinner than Canon G15.
Here is the back view size comparison of Panasonic ZS8 and Canon G15.
Now lets look at the top view comparison of Panasonic ZS8 and Canon G15.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic ZS8 is significantly lighter (142g ) than the Canon G15 which may become a big advantage especially on long walking trips.
Unfortunately neither Panasonic Lumix DMC-ZS8 (Lumix DMC-TZ18) nor Canon PowerShot G15 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 ZS8 and Canon G15's LCD screens has the same diagonal size of 3.00".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.