I also had the RZ as a courtesy car while my RX was being serviced. The RZ was a Takumi grade, lots of toys and generally a lovely car. Drove very well, very quiet and responsive. I liked the ultra-suede upholstery. The cabin trims felt quite flimsy, plastic was abundant and very thin with exposed edges. Getting back into the RX really highlighted how solidly built it was, the RZ nowhere near as 'classy'.
I think the RZ has been designed with massive weight saving in mind?