Haven't tried them, haven't heard or seen any reviews about them either until reading the one in your link.
So da German mag reviews da German made tire and it wins hands down. Could be possible they're right.
They only used one type of bike, doesn't say if they used multiple riders. Or give a estimated mileage for the tire.
The FJR is 70 lbs lighter then the C14 if that has any bering on this test? Possible.
I'm curious what they cost because I know the PR4GT's are a little pricey.
I ride with a few peeps that use nothing else but Metzler. The number of people I ride with that use Michelin is 8 to 1 that will use nothing else( until something better arrives

)
It'd be nice to see some rave reviews from a couple of Connie owners about these tires.