Thing is, I do use Siri.
Siri's accuracy is much worse than Google's, but let's say that it's just me (it's not because I've tried with some other people). One week ago I went to Mt Rainier Ntl Park and wanted to check the weather. I was using an iPhone 5 at that time so I asked Siri. "Hey Siri, what's the weather like in Paradise, WA?". First time, it did not understand what I said. Next 4 times, it did understand but it gave the forecast for Washington, DC. I was driving, yelled "OK Google" and the Nexus sitting on the back seat wakes up. I ask the same question, and sure it does tell me the forecast for Paradise, in Washington State.
This is just one example. I can give you as many as you want. For me, Siri has been a frustrating experience. I surely wish it was way better since my iPhone 7 is coming either today or tomorrow, and I will miss Google Now A WHOLE LOT. To the point that I'm sure I'll just use the Google App instead of Siri.
Okay Blue, let's concede that Google Now may hear more accurately at times, which I also pointed out. However, your main claim was that Google Now was "light years, dozens of light years ahead" "in what Google can do." You still haven't given any support to that rather dubious claim.