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 Sony A6600 and Sigma fp side-by-side from the front, back and top in their relative dimensions. Sony A6600 has external dimensions of 120 x 67 x 69 mm (4.72 x 2.64 x 2.72″) and weighs 503 g (1.11 lb / 17.74 oz) (including batteries). Sigma fp has external dimensions of 113 x 70 x 45 mm (4.45 x 2.76 x 1.77″) and weighs 422 g (0.93 lb / 14.89 oz) (including batteries).
Below you can see the front view size comparison of Sony A6600 and Sigma fp. Sigma fp is 7mm narrower and 24mm thinner than Sony A6600 but it is also 3mm taller.
Here is the back view size comparison of Sony A6600 and Sigma fp.
Now lets look at the top view comparison of Sony A6600 and Sigma fp.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Sigma fp is significantly lighter (81g ) than the Sony A6600 which may become a big advantage especially on long walking trips.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you have to also take into account the lenses that you will be using with these bodies. Since Sigma fp has a Full frame sensor and Sony A6600 has a smaller APS-C sensor, Sony A6600's lenses for a similar focal length and aperture will generally be lighter and smaller than the Sigma fp lenses.
Both A6600 and fp have weather sealings in their body, making them resistant to water and dust.
LCD Screen Size and Features
Sigma fp's 3.2 LCD screen is slightly larger than Sony A6600's 3" screen.
On the other hand, Sony A6600 LCD screen has a Tilting feature
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels. On the other hand, Sigma fp has a fixed type screen which provides less flexibility in shooting positions compared to A6600.