Canon EOS R vs Canon EOS 1D Mark IV

This is a full comparison between the cameras Canon EOS R and Canon EOS 1D Mark IV. We compare them by looking at the categories you see below.

Manufacturing

These cameras are both manufactured by Canon.

Type of camera

Canon EOS R is a Mirrorless camera while Canon EOS 1D Mark IV is a DSLR camera. More information about their differences will come soon.

Sensors / crop factor

These cameras have different sensors. Canon EOS R has a "FF"-sensor while Canon EOS 1D Mark IV has a "APSH"-sensor, and their difference in sensors will also affect the crop factor and experience focal length. See the table below.

** Experienced focal length when using a lens such as a common "50mm f/1.8"

Learn more about crop factor and focal length multiplier here:
Camera selection can affect the focal length (Canon)

Resolution

Canon EOS R has a 30 MP (Megapixels) resolution while Canon EOS 1D Mark IV has 16,1 MP. If we break down this in more detail this is the data behind the numbers:

Canon EOS R has a 88 % larger resolution than Canon EOS 1D Mark IV. This could give you more details in the picture but also a possibility to crop more in the pictures, afterward while editing the pictures, if needed that is.

ISO range

Canon EOS 1D Mark IV has a larger ISO-range than Canon EOS R. Canon EOS 1D Mark IV has an ISO range that stretches from 50 to 102400 while Canon EOS R has 100 to 40000.

Autofocus and lens compatibility

Both of these cameras have a built-in autofocus motor. Some lenses, that support autofocus, do not have an autofocus motor of their own but this won't cause any problems with these two cameras.

Worth mentioning is that Canon EOS R belongs to the Canon EOS R-system and needs an adapter to work with Canons EF, EF-S, MP-E, and TS-E lenses. You can read more about this adapter here:
Canon Lens Mount Adapter EF-EOS R

Here is a complete overview of which lenses work with each camera:
Lens compatibility chart for Canon EOS R
Lens compatibility chart for Canon EOS 1D Mark IV

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Canon EOS R can shoot up to 8 pictures per seconds and Canon EOS 1D Mark IV can shoot up to 10 pictures per seconds.

Ability to record movies

It is becoming more and more popular to record movies with digital cameras.

When comparing these two cameras there is only one of them that can shoot movies and that is Canon EOS R. Unfortunately Canon EOS 1D Mark IV does not support recording movies and movie clips.

Weight

The weight of the camera can be an extremely important factor, especially if the camera is about to be used, or carried around, for several hours at a time.

Canon EOS 1D Mark IV weighs 1230 gr (equal to 2,71 lb) which is 86% heavier than Canon EOS R and its 660 gr (or 1,46 lb).