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 Nikon D750 and Canon SX420 IS side-by-side from the front, back and top in their relative dimensions. Nikon D750 has external dimensions of 141 x 113 x 78 mm (5.55 x 4.45 x 3.07″) and weighs 840 g (1.85 lb / 29.63 oz) (including batteries). Canon SX420 IS has external dimensions of 104 x 69 x 85 mm (4.09 x 2.72 x 3.35″) and weighs 325 g (0.72 lb / 11.46 oz) (including batteries).
Below you can see the front-view size comparison of the Nikon D750 and the Canon SX420 IS. Canon SX420 IS is 37mm narrower and 44mm shorter than Nikon D750 but it is also 7mm thicker. As you can tell, actually this is not a fair size comparison since Canon SX420 IS has a built-in lens but Nikon D750 doesn't. Once you put a lens on D750, its thickness will increase significantly.
Here is the back view size comparison of the Nikon D750 and Canon SX420 IS.
Now lets look at the top view comparison of Nikon D750 and Canon SX420 IS.
Weight is another important factor, especially when deciding on a camera that you want to carry with you all day.
Canon SX420 IS is significantly lighter (515g ) than the Nikon D750 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 D750, the total kit will weigh much higher.
Weather Sealing
With its weather-sealed body, we believe that the D750 has a big advantage over the SX420 IS which doesn't provide any kind of environmental sealing.
LCD Screen Size and Features
Nikon D750's 3.20" LCD screen is slightly larger than Canon SX420 IS's 3 screen.
In addition to the size advantage, Nikon D750 LCD screen also has a
Tilting feature where you can change the angle of the screen to make it easier to shoot from waist or over-the-head levels. On the other hand, Canon SX420 IS has a fixed type screen which provides less flexibility in shooting positions compared to D750.