I'm not sure that the route is doing that well, having just flown it. Light loads in economy coming back although the front end wasn't bad. Probably about 50% LF. Outward to CAN was maybe closer to 75 - 85%. So it's a bit mixed. I was connecting through to AKL. Fares are VERY low.
Service was excellent although food / inflight entertainment were pretty average. Connecting in CAN was very easy.
They fly the 787 but the seats are quite cramped. Not a problem at 50% though.
My impression was that CZ / CAN are very keen to grow their reputation for hubbing around Asia / Oceania and so are investing in capacity. I suspect that they are currently making very little money on the route.