Oh, I've taken it to those roads. And to Route Twisk, which is the MOST AWESOMEST mountain road in HK, in my opinion. Several times.
The BRZ is still very rare. 86s are more common, although also quite rare. The dealership you saw the BRZ in was almost certainly the main Subaru franchise's showroom. I remember going in to put my deposit down, and I think they do too, since it was basically along the lines of "SHUT UP AND TAKE MY MONEY!!". I was, in fact, the first person to put down a deposite on one with them.