I had my hand luggage weighed on NZ last week flying MEL-CHC, wasn't expecting it at all. I was going to ski so was carrying my ski boots in my hand luggage (as I can live without using my own skis if they are lost but need my boots!) as well as just a couple of clothes, camera chargers, etc. I knew it would be over when she asked, so I put it on the scales and it was 10kg. Luckily for me I know my ski boots are exactly 7kgs, so I did what no one wants to be stuck behind and emptied the rest of the contents in to a plastic bag making my main carry on bag 7kg. I asked her why and she said for safety reasons, she then said you aren't allowed to put that stuff back in the bag after I put the sticker on it and it will be reweighed at the gate. I said yep that's fine and went on my merry way with my standard size hand luggage and plastic bag! Proceeded to put it all back in to the one back around the corner, no weighing at the gate and all fine.
On the flight back CHC-MEL I was on Jetstar with the exact same bag and weight and it wasn't weighed at check in.
So the whole full service vs LCC thing doesn't hold cause even trans tasman Air NZ is much better with AVOD and I loved the ability to just order food off the screen.