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 ZS15 and Pentax MX-1 side-by-side from the front, back and top in their relative dimensions. Panasonic ZS15 has external dimensions of 105 x 58 x 33 mm (4.13 x 2.28 x 1.3″) and weighs 208 g (0.46 lb / 7.34 oz) (including batteries). Pentax MX-1 has external dimensions of 122 x 61 x 51 mm (4.8 x 2.4 x 2.01″) and weighs 391 g (0.86 lb / 13.79 oz) (including batteries).
Below you can see the front view size comparison of Panasonic ZS15 and Pentax MX-1. Panasonic ZS15 is clearly the smaller of the two cameras. Its body is 17mm narrower, 3mm shorter and 18mm thinner than Pentax MX-1.
Here is the back view size comparison of Panasonic ZS15 and Pentax MX-1.
Now lets look at the top view comparison of Panasonic ZS15 and Pentax MX-1.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Panasonic ZS15 is significantly lighter (183g ) than the Pentax MX-1 which may become a big advantage especially on long walking trips.
Unfortunately neither Panasonic Lumix DMC-ZS15 (Lumix DMC-TZ25) nor Pentax MX-1 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 ZS15 and Pentax MX-1's LCD screens has the same diagonal size of 3".
On the other hand, Pentax MX-1 features a Tilting screen
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels whereas the Panasonic ZS15 has a fixed type screen which provides less flexibility in shooting positions compared to MX-1.