it's been what, five years now? Thanks, but I'll keep using Google. You can continue to wait for plausibly accurate dictation engine from Apple.
For what it's worth, it is pretty accurate when I use Siri. Siri makes my life a little easier with setting alarms, timers, or dictating texts/calling people when I'm driving. That's it, though. Just a little easier.
Siri's not particularly smart. Neither is Google's solution, though; nor Amazon's, nor Microsoft's. None are anywhere close to what we've seen in science fiction. Until some serious advancements are made, I'll happily take a bit poorer recognition, iOS integration, and user privacy in the interim.
So yeah, I'll continue to wait. So will you, by the way. It's not like Google's current system rivals the Enterprise computer.