You know you're in trouble when the best proof for your display quality claim is a bunch of shitty phone camera photos
Well to be fair the difference is still noticeable, you can clearly see the UI in the N3DSXL where all bright detail on the Reg XL is washed out. I would have preferred he showed the same image on both screens though to have a more direct comparison, sub-par camera or not.
Regardless, thanks for bringing this to everyone's attention OP. I don't own a N3DSXL yet but that's good info to know.