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 GXR A16 24-85mm F3.5-5.5 and Olympus PEN-F side-by-side from the front, back and top in their relative dimensions. Ricoh GXR A16 24-85mm F3.5-5.5 has external dimensions of 114 x 75 x 93 mm (4.49 x 2.95 x 3.66″) and weighs 550 g (including batteries). Olympus PEN-F has external dimensions of 125 x 72 x 37 mm (4.92 x 2.83 x 1.46″) and weighs 427 g (0.94 lb / 15.06 oz) (including batteries).
Below you can see the front view size comparison of Ricoh GXR A16 24-85mm F3.5-5.5 and Olympus PEN-F. Olympus PEN-F is 3mm shorter and 56mm thinner than Ricoh GXR A16 24-85mm F3.5-5.5 but it is also 11mm wider. As you can tell, actually this is not a fair size comparison since Ricoh GXR A16 24-85mm F3.5-5.5 has a built-in lens but Olympus PEN-F doesn't. Once you put a lens on PEN-F, its thickness will increase significantly.
Here is the back view size comparison of Ricoh GXR A16 24-85mm F3.5-5.5 and Olympus PEN-F.
Now lets look at the top view comparison of Ricoh GXR A16 24-85mm F3.5-5.5 and Olympus PEN-F.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Olympus PEN-F is significantly lighter (123g ) than the Ricoh GXR A16 24-85mm F3.5-5.5 which may become a big advantage especially on long walking trips.
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 PEN-F, the total kit will weigh much higher.
Unfortunately neither Ricoh GXR A16 24-85mm F3.5-5.5 nor Olympus PEN-F 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 Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Ricoh GXR A16 24-85mm F3.5-5.5 and Olympus PEN-F's LCD screens has the same diagonal size of 3".
On the other hand, Olympus PEN-F sports a Fully Articulated screen
which you can change the angle and position of the screen almost freely, making it possible to shoot from waist or over the head levels, and especially very useful for shooting selfies and video. Ricoh GXR A16 24-85mm F3.5-5.5's LCD screen is a fixed type which provides almost no flexibility in shooting positions compared to PEN-F.