The present wording of s. 59 can be found on line: click here.
I mentioned a literature review on the effects of corporal punishment, and you can find that here.
There's another article on public submissions to the amendment Bill that may also be interesting, here. But remember that, while public opinion is relevant to Parliament's deliberations, it is not the only factor to consider. International legal obligations on States and research-based evidence need to be taken into account.
The UN convention on the rights of the child includes a periodic review of NZ as a signatory. Click here for more info, and then click on the link that says 'concluding observations' to download the most recent UN Committee report on NZ (dated 2003). That document does include comments about S. 59.