I think there is some difference between the standard model and the Premium, but not between the Premium and the Platinum, other than the grill inserts.
evois asked if there were any front end differences that made the clear bra cut outs not fit right and that was why I was saying the Standard model I believe is a little different than the Premium or Platinum for the cut-outs. Obviously I know there are differences inside a Premium vs Platinum but that is not what he asked.Lot of differences and features between the standard and Premium.
Premium and Platinum is not so different. Platinum is basically a Premium with a few add ons like the cooler, different grill, different rims, and different interior options.
I am bummed Cadillac didn't add Dual exhausts in the new platinums along with heated/cooled cup holders. The 2013 Platinum I have now does have the duals and sounds amazing. Also they should have jacked the power up a little like 445-460 hp.