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 Samsung NX100 and Panasonic LZ20 side-by-side from the front, back and top in their relative dimensions. Samsung NX100 has external dimensions of 120 x 71 x 35 mm (4.72 x 2.8 x 1.38″) and weighs 282 g (0.62 lb / 9.95 oz) (including batteries). Panasonic LZ20 has external dimensions of 120 x 76 x 80 mm (4.72 x 2.99 x 3.15″) and weighs 499 g (1.10 lb / 17.60 oz) (including batteries).
Below you can see the front-view size comparison of the Samsung NX100 and the Panasonic LZ20. Samsung NX100 has the same height with Panasonic LZ20. On the other hand, with a width of 71mm, it is 5 narrower and also with a thickness of 35mm, it is 45mm thinner than Panasonic LZ20. As you can tell, actually this is not a fair size comparison since Panasonic LZ20 has a built-in lens but Samsung NX100 doesn't. Once you put a lens on NX100, its thickness will increase significantly.
Now lets look at the top view comparison of Samsung NX100 and Panasonic LZ20.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Samsung NX100 is significantly lighter (217g ) than the Panasonic LZ20 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 NX100, the total kit will weigh much higher.
Weather Sealing
Unfortunately neither the Samsung NX100 nor Panasonic Lumix DMC-LZ20 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 Top Bridge Cameras with Weather Sealing
LCD Screen Size and Features
Samsung NX100 and Panasonic LZ20'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.