Would it be a downgrade in features / results from a 5D IV to a 6D II?

[RyanV]

Owning both the 5DS and a 6D MKII plus able to use work 5D MKIV my biggest frustration when going back to the 6D MKII is the D pad as opposed to the joystick for moving AF points in portraiture. Its much faster on the 5DS and 5D MKIV.
For landscape work I do find the articulating screen useful and the slightly lower weight of the body and in the most part the IQ is not an issue. the 5D MKIV is a better low light camera than either the 5DS or the 6D MKII and with a better spread of AF points something Canon compromised deliberately on the 6D MKII (contrary to what some may say its useful having a wider spread of AF points even when shooting landscape).

All that said the 6D MKII for its price against the 5D MKIV is a great camera and if its your only camera it will do everything asked of it without being special in any of them.

Thank you for this concise and straightforward answer to the question. Learning a lot here thanks to posts like this..