Had the older S-02, older comp TA's, Dunlops and then a few others I try to forget (Pirelli...what hunks of shit). Loved many of them, until I met the bridgestones...whole new world of grip.
I run Pilot sports now..and you'd be hard pressed to get me to change, outside of the S-03, unless of course Michelin keeps jacking the price on me. I've never had grip like this on a street tire. Wet...nothing holds a candle, and great dry grip. The KD is untried for me, but the extremely poor wet manners I keep hearing about negate any slight dry drip advantage they offer (though if anyone wants to send me a free test set in 245/45-16, I'll be happy to put them through the paces

).
Michelins are a bit better wet tire than the S-03 from what I've seen, and the Bridgestones are a little better dry.
Bob