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 Ricoh GR III and Sigma DP2 Quattro side-by-side from the front, back and top in their relative dimensions. Ricoh GR III has external dimensions of 109 x 62 x 33 mm (4.29 x 2.44 x 1.3″) and weighs 257 g (0.57 lb / 9.07 oz) (including batteries). Sigma DP2 Quattro has external dimensions of 161 x 67 x 82 mm (6.34 x 2.64 x 3.23″) and weighs 395 g (0.87 lb / 13.93 oz) (including batteries).
Below you can see the front view size comparison of Ricoh GR III and Sigma DP2 Quattro. Ricoh GR III is clearly the smaller of the two cameras. Its body is 52mm narrower, 5mm shorter and 49mm thinner than Sigma DP2 Quattro.
Here is the back view size comparison of Ricoh GR III and Sigma DP2 Quattro.
Now lets look at the top view comparison of Ricoh GR III and Sigma DP2 Quattro.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Ricoh GR III is significantly lighter (138g ) than the Sigma DP2 Quattro which may become a big advantage especially on long walking trips.
Unfortunately neither Ricoh GR III nor Sigma DP2 Quattro 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
Ricoh GR III and Sigma DP2 Quattro'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.