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Mine doesn't always use the new voice, it's weird. I was exclusively getting the same old Siri voice until I saw everyone saying the new voice existed. I kept having pointless conversations with Siri until she finally piped up with her new voice. I get it maybe 1 out of every 10 things I say to her. Definitely an improvement.
 
A big part of it is preset responses vs. Siri reading things to you on the fly. It tends to sound a lot more realistic when it has a prerecorded response in comparison to when it has to read you something since it's basically just pasting words together and pronouncing them.
 
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