Another datapoint.
Please understand that this is apples to oranges, and unfair to the Michelins at multiple levels, but I just replaced the OEM Michelins at 30K miles with Pirelli P7s.
I have a 2015 S85D, and I'm not a particularly aggressive driver 90% of the time, but will push the car hard every so often. We have four seasons where I live, but rarely more than 2-3 days of snow a year. Lots of rain year round.
The Michelins still had more than 50% of their original tread at 3.5 years and 30K miles, but they were becoming increasingly noisy and slippery. Dry traction was mediocre and wet (especially cold) traction was awful. Also, for reasons not entirely clear, I'd had more flats in two of these tires in 18 months than all of my other cars combined over the last ten years or so. My garage is plumber for air tools, so checking and maintaining pressure is simple for me, but I got fed up with airing tires up literally every morning.
The Pirellis are of course brand new, but they are dramatically quieter and have much better grip in dry and wet conditions. I haven't been in hot conditions yet, but in temps from high twenties to seventies they are a dramatic improvement from the middle aged michelins.
