Size and weight are big decision factors when you are trying to find the ideal camera for your needs.
In this section, we are going to illustrate the Sony A7 III and Leica Q-P side-by-side from the front, back and top in their relative dimensions. Sony A7 III has external dimensions of 127 x 96 x 74 mm (5 x 3.78 x 2.91″) and weighs 650 g (1.43 lb / 22.93 oz) (including batteries). 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).
Below you can see the front-view size comparison of the Sony A7 III and the Leica Q-P. Sony A7 III is 3mm narrower and 19mm thinner than Leica Q-P but it is also 16mm taller. As you can tell, actually this is not a fair size comparison since Leica Q-P has a built-in lens but Sony A7 III doesn't. Once you put a lens on A7 III, its thickness will increase significantly.
Here is the back view size comparison of the Sony A7 III and Leica Q-P.
Now lets look at the top view comparison of Sony A7 III and Leica Q-P.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Leica Q-P is 10g lighter than the Sony A7 III but we don't think this will make a significant difference.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on A7 III, the total kit will weigh much higher.
Weather Sealing
With its weather-sealed body, we believe that the A7 III has a big advantage over the Q-P which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Sony A7 III and Leica Q-P's LCD screens have the same diagonal size of 3.00 inches.
On the other hand, Sony A7 III 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 Leica Q-P has a fixed type screen which provides less flexibility in shooting positions compared to A7 III.