The Jag is "swirl-free", though it has scratches that I don't polish out because the (original) paint is getting too thin. But then I hardly ever drive it. But yeah, even with its soft lacquer I can wash/dry/use it without it getting marred.
I keep the S8 marring-free, have since I got it except for the whole "deer incident" business where it was washed by others. Note that *one* wash, by concientous people who were being careful, made it look just awful to me, but they honestly claimed they couldn't see what I was talking about (I guess most people can't on silver). I haven't driven it much this winter, but the last two winters it was driven all the time (and it recently got *nasty-dirty* during our Thanksgiving trip, no problem).
I usually don't even get marring on our minivan, which I drive almost every day, year round.
But then I spend hours and hours on every wash, every stroke done with care (and with the foamgun), many mitts even when the vehicle looks too clean to wash, etc. etc. It's *not* easy, it's very hard work and frankly, rather nerve-wracking. And every now and then I'll still get careless and induce some fine marring. But I get it right out and try to do better.
But to be honest, my wife's car, which is *not* marring free, looks almost as good to most people. The whole "marring free" business is just a personal challenge for me and I honestly don't know if I'll keep pursuing it. Life's too short, and I sometimes find myself not using the S8 because I'll have to wash it.