SYD allows anything through for carryon (similar to US); MEL is somewhat stricter but still reasonable. As mentioned AKL often enforces the weight limit to the letter, however 14kg for J is generous (more of a problem for 7kg in Y). No idea about CNS but that shouldn't be a concern for your trip being the last leg. My own experience is 0.1 kg over is enough to require removing an item from the bag (and putting in your pocket) or checking the bag