[Brightcolours]

Tell me if i am wrong, this high DR advantage to Nikons is limited to low ISO settings only, right?

So which ISO setting sort of equalizes this advantage? 400?

With the 6D versus the D610 and D800, the difference at base ISO (ISO 100) is about 2 stops, according to DXO. That difference gets smaller with increased ISO settings, because the Canon sensor gives better light capture (but the Sony sensors have less ADC noise).

At about ISO 800 things are pretty equal (11.5 DR for 6D, 12 DR for D800) and at ISO 3200 and higher the 6D has the advantage (about half a stop).

 

That is just for DXO measurements, for whatever they are worth. In real usage, the 6D does visually better at higher ISO's, with better colours and finer noise.

 

It is anyway not a big deal, all these cameras are very capable. The 6D just also is a nice "small" FF DSLR camera to use.