[miro]

Just came across this article 
https://petapixel.com/2020/06/24/this-is...n-dxomark/

1Dx markiii scored badly in DXO mark because it has higher native ISO and measurements are made at native ISO, but at equivalent ISO speeds it does pretty well.   A sports photographer  won't mind this if it gives him any advantage at high ISO setting.
 
Here's what DXO themselves have to say about it 

https://www.dxomark.com/canon-eos-1d-x-m...or-review/

So again the dynamic range values are measured at native ISO (which is basically the ISO speed used on tripod for landscapes and where we need the most of dynamic range)

Hi Toni,
I have dig into the sensor technology in the past. There is something fundament that you have to understand. The sensor design begins with definition of sensor parameters- mostly based on use cases. Just to name few of them
-         Sensor size
-         Number of pixels.
-         Light sensitivity – so called base ISO value
-         Dynamic range
-         Color reproduction
 
As anything in the nature parameters play agains ach other. I have electrical engineer background and  understand it. This fundamental apply in many science area.  I’ll try to use biological example – close to your background.  You cannot have animal that fly as an bird, swim as an fish and run as cheetah. There are such all rounder animals like ducks, they do everything but nothing is best.
Same principe applies in sensor design too. In general sensor with higher DR have lower ISO performance. Canon designers made a great job with balancing those parameters. What need the average 1Dx shooter?
-         Higher frame rate
-         Fast AF
-         Excellent low light performance even in it scarify other IQ parameters – e.g. Megappixel count, DR, color reproduction
DXo try to use quotative numbers to represent The problem is that the average person doesn’t  know the meaning of this numbers.