The study looked specifically at the knowledge box presented by each personal assistant.
Google returned double as many knowledge boxes as Siri.
Google Now returns twice as many results as Siri and nearly three times as many results as Cortana. This is clear evidence that Google is much further down the path with this type of work than either Apple or Cortana. As noted above, Bing, using text-based search queries, returns knowledge boxes for more types of results than Cortana does at this time.
It also fully answered the question far more often than the other assistants.
Looking at the scores here, one might conclude that Cortana and Siri are genuinely bad based on the scores. However, please bear in mind that this was a knowledge base test. The enhanced results returned in both systems had a far higher rate of being at least somewhat helpful, and in Cortana’s case, had a high rate of improving the standard search results.
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