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The Bike Test
For our standard bike test, we used the Canon EOS 5D Mark IV in Case 1, which is suggested as a versatile set of parameters for a variety of subjects - and for the most part, it didn't disappoint.
Single point focus
When you stick to your subject with a single point just for depth tracking, the hit rate is very nearly 100%.
iTR focus tracking
When you switch to iTR tracking, however, the hit rate drops, but not so much as to render the setting unhelpful, particularly if you're in an unfamiliar situation where you may not be able to follow the movement of your subject. And indeed, the 'misses' with iTR are slight enough to be fairly insignificant at normal viewing sizes.
Dual Pixel AF Tracking
Using Dual Pixel AF in continuous shooting also netted a high number of keepers, showing some advantage to this new system over our previous experience with the EOS 80D. Unfortunately, despite the increased effectiveness of the system, it is arguably a less useful feature on the 5D Mark IV than on its APS-C cousin, due to the fixed screen. This limits your ability to use the touchscreen to track subjects and fire off bursts when working at odd angles - say holding it above your head to track subjects at a wedding reception, for example.
And something else to keep in mind - as you 'tap' your subject, the tracking box will grow or shrink as it decides what exactly to track. It would vary from just Dan's head to most of Dan's upper body. As such, if you find you need more fine control over exactly where you need the camera to autofocus, you may have better luck using a single point through the viewfinder.
But as is the nature with any autofocus system, particularly during subject tracking, Dual Pixel AF not infallible. Check out how the camera confused Dan's ride with a slightly less environmentally conscious mode of transportation.
Here, we watched as the tracking 'box' strayed off of Dan and onto the similarly colored Prius as it drove behind him. Focus did not return to Dan until we re-tapped to acquire him as a 'new' subject.
https://www.dpreview.com/reviews/canon-eos-5d-mark-iv/8
