Tracked the Dunlop Z2.
By the end of the day, this is what they look like:
The grip is unbelievable, it's very hard to push the tires to the limit (personally). The tires did not become greasy nor lose "any" grip. Felt the same from lap 1 to the last (approx. 15 laps). Also the sidewall is FIRM, the new tires pebbles are still there.
Haven't driven on RE-11s or any other extreme tires, but it's safe to say you can't go wrong with these Dunlops.