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 Canon G3 X and Samsung NX300M side-by-side from the front, back and top in their relative dimensions. Canon G3 X has external dimensions of 123 x 77 x 105 mm (4.84 x 3.03 x 4.13″) and weighs 733 g (1.62 lb / 25.86 oz) (including batteries). Samsung NX300M has external dimensions of 122 x 64 x 41 mm (4.8 x 2.52 x 1.61″) and weighs 331 g (0.73 lb / 11.68 oz) (including batteries).
Below you can see the front-view size comparison of the Canon G3 X and the Samsung NX300M. Samsung NX300M is clearly the smaller of the two cameras. Its body is 1mm narrower, 13mm shorter and 64mm thinner than Canon G3 X. As you can tell, actually this is not a fair size comparison since Canon G3 X has a built-in lens but Samsung NX300M doesn't. Once you put a lens on NX300M, its thickness will increase significantly.
Now lets look at the top view comparison of Canon G3 X and Samsung NX300M.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Samsung NX300M is significantly lighter (402g ) than the Canon G3 X 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 NX300M, the total kit will weigh much higher.
Weather Sealing
With its weather-sealed body, we believe that the G3 X has a big advantage over the NX300M which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Samsung NX300M's 3.30" LCD screen is slightly larger than Canon G3 X's 3.2 screen.