We had an argument recently, and I did accuse my wife of her thinking that she's always right (and I'm always wrong). It did not go down well...
But yes, we do reach more or less the same conclusions with stuff, even if there is different reasoning. If I come to the same conclusion after her, she might say "I just said that" and I have to explain that I agree with her
We seem to have mutual respect for each other's level of intelligence too. I think that's important to help keep things balanced, if we're both (even if slightly) in awe of each other's abilities. That and funny jokes as well.