I had the Sumitomo HTRymerZ3s on the R and was happy with them. Good tire, cheap as hell too.
I switched to Rivals, and they were incredible tires, rain traction was fine until they got down to about 25% tread, then sketchy. These hold up well to camber challeneged, front weight biased cars.
I then had Pilot Super Sports and they were the best all around tire, better in rain than the Rivals, but not as good as the HTRZ3s, and in the dry, better than the HTRZ3s, but not the Rivals (although closer to rivals than HTRZ3). Recommend.
The Mustang came with P Zero summers, and while most hate them, I enjoyed them.
I'll be buying take of P Zeros for 2016 most likely.