RNZ have been putting these out over the last few days:

On repeat: What hours of interviews reveal about the obsessions of our political leaders (Luxon overwhelming focuses on taxing and spending)

Who hogs the microphone when political leaders do their weekly rounds? (they all hog it pretty equally, Luxon slightly more than Ardern, Hipkins slightly less)

Christopher lucks in as the real Mr Chippy (Luxon uses slightly more positive and negative language than Ardern or Hipkins, who are pretty similar)

What Chris Hipkins says when he wants to change the subject (Luxon uses much more “block and bridge” statements than Hipkins or Ardern. His favourite is “the reality is”, while Hipkins’s is “as I’ve indicated” and Ardern’s was “as I say”)