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 Nikon L120 and Pentax K-01 side-by-side from the front, back and top in their relative dimensions. Nikon L120 has external dimensions of 110 x 77 x 78 mm (4.33 x 3.03 x 3.07″) and weighs 431 g (0.95 lb / 15.20 oz) (including batteries). 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).
Below you can see the front view size comparison of Nikon L120 and Pentax K-01. Nikon L120 is 12mm narrower and 2mm shorter than Pentax K-01 but it is also 20mm thicker. As you can tell, actually this is not a fair size comparison since Nikon L120 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 Nikon L120 and Pentax K-01 Size, Weight and External Dimensions - Front View
Here is the back view size comparison of Nikon L120 and Pentax K-01.
Comparison image of Nikon L120 and Pentax K-01 Size and Weight - Back View
Now lets look at the top view comparison of Nikon L120 and Pentax K-01.
Top View Comparison image of Nikon L120 and Pentax K-01 Size
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Nikon L120 is significantly lighter (130g ) than the Pentax K-01 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 K-01, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither Nikon Coolpix L120 nor Pentax K-01 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 Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Nikon L120 and Pentax K-01's LCD screens has the same diagonal size of 3.00".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.