I have some single-hopped Pale Ales bottle conditioning right now that include Nelson, Rakau and Motueka. They're carbing up now, so I'll post my tasting notes in another week or two.
Here are my notes I took on the aroma of the hops themselves:
Rakau (11.4% - from Rebel): grassy, tropical fruit, spice
Motueka (7.2% -from Rebel): herbal/citrus (noble-like with a citrus kick)
Nelson Sauvin (12.1% - from AHS): American/West Coast hop aroma; fruit/citrus with a distinct "white wine" note
I really liked the Motueka, and had a note that I wanted to brew a Pils with it. The descriptors I read said it has a lime or lemon-lime aroma, but I couldn't get that just off the hops - it was just a nondescript "citrus" to me. Maybe more of that character will show up in the finished beer.
I remember being a bit disappointed in the Rakau. I think I was expecting a bombastic Citra/Galaxy aroma when I cracked into the package, but the hops themselves weren't as aromatic as I hoped. I'll reserve judgement until I taste the final product though.
The NZ hop I want to try the most is Riwaka, but I haven't seen it available this year.