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 Canon 90D and Canon 5D MIV side-by-side from the front, back and top in their relative dimensions. Canon 90D has external dimensions of 141 x 105 x 77 mm (5.55 x 4.13 x 3.03″) and weighs 701 g (1.55 lb / 24.73 oz) (including batteries). Canon 5D MIV has external dimensions of 151 x 116 x 76 mm (5.94 x 4.57 x 2.99″) and weighs 890 g (1.96 lb / 31.39 oz) (including batteries).
Below you can see the front view size comparison of Canon 90D and Canon 5D MIV. Canon 90D is 10mm narrower and 11mm shorter than Canon 5D MIV but it is also 1mm thicker.
Here is the back view size comparison of Canon 90D and Canon 5D MIV.
Now lets look at the top view comparison of Canon 90D and Canon 5D MIV.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon 90D is significantly lighter (189g ) than the Canon 5D MIV which may become a big advantage especially on long walking trips.
Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you have to also take into account the lenses that you will be using with these bodies. Since Canon 5D MIV has a Full frame sensor and Canon 90D has a smaller APS-C sensor, Canon 90D's lenses for a similar focal length and aperture will generally be lighter and smaller than the Canon 5D MIV lenses.
Both 90D and 5D MIV have weather sealings in their body, making them resistant to water and dust.
LCD Screen Size and Features
Canon 5D MIV's 3.2" LCD screen is slightly larger than Canon 90D's 3 screen.
On the other hand, Canon 90D sports a Fully Articulated screen
which you can change the angle and position of the screen almost freely, making it possible to shoot from waist or over the head levels, and especially very useful for shooting selfies and video. On the other hand, Canon 5D MIV has a fixed type screen which provides almost no flexibility in shooting positions compared to 90D.