The well-known Piper Jaffray analyst, Gene Munster, issued the latest version of his Siri report card, noting that Siri has continued to improve under iOS 7, particularly in terms of being able to properly interpret questions being asked. He had the following to say regarding the improvement:
The primary improvement between Siri in iOS 6 and iOS 7 came from its performance in noisier areas, where Siri was able to translate better through a noisy environment (94% vs. 83% correct in Aug iOS 6). Based on our testing, iOS 7 Siri's net ability to answer questions (factors in questions not correctly understood) improved to 79% from 77% in August with iOS 6.
Apple’s Siri was also compared to Google Now, finding that the two services seem to be tied in effectiveness with a “C+” score after Siri held a substantial lead in the year-ago testing. In the most recent test, Google Now actually held small leads in content areas such as commerce information, while Siri performed significantly better for operating system controls.
Have you found Siri being more useful after upgrading to iOS 7?
Source: Piper Jaffray