I've completed my free trial of Kagi and I can confirm that the quality of the search results it produces is superb.
A while back, I was searching for how to configure Postfix on Fedora CoreOS. I shared an image of my DDG search results, which showed genAI slop tutorial sites among the top three results.
I ran the same search query on Kagi, and the top two results were something close to what I wanted and which I could hypothetically work with. The thing is that there doesn't seem to be much info out there on setting up Postfix specifically on CoreOS to begin with.
On Kagi, the Shells KB slop site showed up as the third result, but Kagi allows me to report it as AI-generated and to exclude it from future search results.
Note: This should not be taken as a rigorous scientific study of a comparison between the two search engines. It's based on my direct experience.