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 Pentax K-01 and Ricoh GXR A16 24-85mm side-by-side from the front, back and top in their relative dimensions. Pentax K-01 has external dimensions of 122 x 79 x 58 mm (4.8 x 3.11 x 2.28″) and weighs 561 g (1.24 lb / 19.79 oz) (including batteries). Ricoh GXR A16 24-85mm has external dimensions of 114 x 75 x 93 mm (4.49 x 2.95 x 3.66″) and weighs 550 g (including batteries).
Below you can see the front-view size comparison of the Pentax K-01 and the Ricoh GXR A16 24-85mm. Ricoh GXR A16 24-85mm is 8mm narrower and 4mm shorter than Pentax K-01 but it is also 35mm thicker. As you can tell, actually this is not a fair size comparison since Ricoh GXR A16 24-85mm has a built-in lens but Pentax K-01 doesn't. Once you put a lens on K-01, its thickness will increase significantly.
Comparison image of the Pentax K-01 and the Ricoh GXR A16 24-85mm Size, Weight and External Dimensions - Front View
Now lets look at the top view comparison of Pentax K-01 and Ricoh GXR A16 24-85mm.
Top View Comparison image of the Pentax K-01 and the Ricoh GXR A16 24-85mm Size
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Ricoh GXR A16 24-85mm is 11g lighter than the Pentax K-01 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 K-01, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Pentax K-01 nor Ricoh GXR A16 24-85mm F3.5-5.5 provides any type of weather sealing in their bodies, 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 Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Pentax K-01 and Ricoh GXR A16 24-85mm's LCD screens have the same diagonal size of 3.00 inches.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.