To the people who only value low ISo Dynamic Range, yes. To those people, the 90D also is a better than the RP, for instance (90D has better low ISo DR).Does that mean that 6D was "slightly better than" 5D series?
Or in my case, it made the 6D II not better enough compared to my 80D to justify the price difference.
But those are just specific subjective aspects. The overall package is what many people base better or worse on.