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 Sony HX400V 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). Sony HX400V has external dimensions of 130 x 93 x 103 mm (5.1 x 3.67 x 4.06″) and weighs 660 g (1.46 lb / 23.28 oz) (including batteries).
Below you can see the front-view size comparison of the Sony A7 III and the Sony HX400V. Sony A7 III is 3mm narrower and 29mm thinner than Sony HX400V but it is also 3mm taller. As you can tell, actually this is not a fair size comparison since Sony HX400V 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 Sony HX400V.
Now lets look at the top view comparison of Sony A7 III and Sony HX400V.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Sony A7 III is 10g lighter than the Sony HX400V 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 HX400V which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Sony A7 III and Sony HX400V's LCD screens have the same diagonal size of 3.00 inches.
Both cameras feature
Tilting screens where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels.