My last iPhone was a 4 so I never had the chance to play with Siri except a few minutes here and there with friends' phones, so I can't compare how earlier iterations are against the new version on my iPhone 5. I can compare it to S-Voice though, which was the woeful attempt to do something similar on my Galaxy S3. S-Voice was awful and completely useless. It wouldn't open any apps and had issues with adding things into the calendar and so on.
Of course, one reason for this particular issue might be the plethora of apps that purport to act as calendars. S-Voice just couldn't keep track of them all so no wonder it couldn't add a calendar entry into the app I wanted. As Android is open source, S-Voice will naturally have a pig of a time trying to integrate itself with the tens of thousands of different apps that users across the world will have on their S3s. so it's hardly surprising that the functionality is less.
I find Siri to be very responsive. Only rarely is their any 'lag' and that's only sometimes when it searches the phone for something which isn't on there and offers to search the web instead. The ability to add calendar entries, reminders, alarms, play music and so on, all of which can be controlled from the earpods whilst the phone is in your pocket, is a work of genius. I think Siri is very good indeed but then maybe I haven't had time to use it as much as many of you that came from a 4S so I have yet to find the limitations inherent in the system.
Overall though it seems to have vastly increased usability compared to S-Voice and whereas with the Samsung I turned S-Voice off pretty much after the first few days of exasperated use, Siri has stayed switched on and I use it daily.
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