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 Leica Q-P and Panasonic ZS100 side-by-side from the front, back and top in their relative dimensions. Leica Q-P has external dimensions of 130 x 80 x 93 mm (5.12 x 3.15 x 3.66″) and weighs 640 g (1.41 lb / 22.58 oz) (including batteries). Panasonic ZS100 has external dimensions of 111 x 65 x 44 mm (4.37 x 2.56 x 1.73″) and weighs 312 g (0.69 lb / 11.01 oz) (including batteries).
Below you can see the front view size comparison of Leica Q-P and Panasonic ZS100. Panasonic ZS100 is clearly the smaller of the two cameras. Its body is 19mm narrower, 15mm shorter and 49mm thinner than Leica Q-P.
Here is the back view size comparison of Leica Q-P and Panasonic ZS100.
Now lets look at the top view comparison of Leica Q-P and Panasonic ZS100.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic ZS100 is significantly lighter (328g ) than the Leica Q-P which may become a big advantage especially on long walking trips.
Unfortunately neither Leica Q-P nor Panasonic Lumix DMC-ZS100 (Lumix DMC-TZ100) 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
Leica Q-P and Panasonic ZS100's LCD screens has the same diagonal size of 3".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.