Do I need a Phono Cable?

With my new turn table, I am re-using spare cables i have at the house.  Currently I am using a pair of 2m AQ King Cobras, and a have of a zip cord for my ground.  Will i really see a difference swapping to something like the Furutech cable or some other phono specific built cable?

I have not seen any issues to day, and I can't imagine a ground will impact sound, but wanted to ask.

Adam