The 4G race is really on!
Just to give an example, I'm sure it's similar around the country, but my folks live in Ashburton and I use SIM cards for all three networks.
When I was here about 10 days ago or so Spark and Vodafone switched on 4G within the space of about a day of each other, nothing from 2degrees.
Arriving here last night and now 2degrees has 4G coverage too.