NikT: As there's obviously a lot of interest in future-proof purchases of devices with the APAC 700MHz LTE band (band 28), I've made some inquiries regarding the M8. On paper, it does support the band, but as the local 700MHz rollout has yet to begin, the device has not been certified for this band under NZ network operating conditions, and may not work as intended/at all in practice (e.g. may require additional power amplifiers, et cetera). Still, definitely a nice-to-have.
You are right, it is nice to have that LTE 700 support. By the time the 700 service is rolled out, I'd probably have moved on to my next device already LoL!!