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 Fujifilm X100F and Fujifilm X-E3 side-by-side from the front, back and top in their relative dimensions. Fujifilm X100F has external dimensions of 127 x 75 x 52 mm (5 x 2.95 x 2.05″) and weighs 469 g (1.03 lb / 16.54 oz) (including batteries). Fujifilm X-E3 has external dimensions of 121 x 74 x 43 mm (4.8 x 2.9 x 1.7 and weighs 337 g (0.74 lb / 11.88 oz) (including batteries).
Below you can see the front-view size comparison of the Fujifilm X100F and the Fujifilm X-E3. Fujifilm X-E3 is clearly the smaller of the two cameras. Its body is 6mm narrower, 1mm shorter and 9mm thinner than Fujifilm X100F. As you can tell, actually this is not a fair size comparison since Fujifilm X100F has a built-in lens but Fujifilm X-E3 doesn't. Once you put a lens on X-E3, its thickness will increase significantly.
Here is the back view size comparison of the Fujifilm X100F and Fujifilm X-E3.
Now lets look at the top view comparison of Fujifilm X100F and Fujifilm X-E3.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Fujifilm X-E3 is significantly lighter (132g ) than the Fujifilm X100F 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 X-E3, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Fujifilm X100F nor Fujifilm X-E3 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 Compact Cameras with Weather Sealing Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Fujifilm X100F and Fujifilm X-E3'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.