A customer has sent me this video of Oakley demonstrating the superiority of their (non-prescription) sunglass lenses.
https://www.youtube.com/watch?v=hUDkCsOxtjg

We don't carry Oakley cycling sunglasses but we carry both KOO and POC brands of cycling sunglasses with Zeiss lenses (non-prescription). How much of what Oakley said they are superior in in the video is true (especially for optical clarity) or are they matched by Zeiss lenses and other top or mid-range sunglass brands? How to explain/show other sunglass options to the customer who thinks Oakley are superior based on the above video?