Subjectively, plant and animal searches feel starkly more superficial (using one use case). It's easy to see with a basic search like "Schizachyrium scoparium", which (iirc) previously returned much more material for the specialist concerned with this species's role in wild habitat from academic and government sources rather than a completely boring laundry list of nurseries, botanical gardens, and such just rephrasing the same basic info. Many of these sites would be ones I'd normally Lower in my results ranking, even.
With DuckDuckGo showing me essentially identical first page results for the above search, for me this experiment renders Kagi almost an Abridged version of DuckDuckGo results without even recourse to seeing More Results at the bottom of each page. This seems a massive handicap, particularly if Lenses don't improve quality of results by much (which they do not seem to be doing for me, here).