Not sure if posted here but finally a decent tyres test that actually compares the new F1AS3, PS4S and Pzero "PZ4" directly against each other:
https://www.caranddriver.com/features/2017-performance-summer-tire-test-feature
Good to know Michelin are still leading by a considerable margin in pretty much every area. My Jaaag had the new PZ4 Pzero's fitted and though they were not as unpredictable or laughable in the cold wet as the older original Pzero was on my Mustang, I could definitely feel that the PZ4 still had that sudden grip loss at limits of traction, thankfully with an AWD the car does a much better job at keeping things tidy than the Mustang did.
But when I removed my near new (6-7mm tread remaining) PZ4 Pzero tyres from my SVR and fitted PS4S the grip in these Winter cold wet conditions was transformed, talking a good few mph faster through corners, roundabouts etc. but when finally at the grip limits and beyond the tyre was simply far better behaved and more predictable, whereas the PZ4 just let go more sudden.
Is the Pzero PZ4 a bad tyre? NO! It is actually a very good tyre, it beats a lot of other premium performance tyres and is vastly superior to a lot of the budget crap on the market, but there are definitely better tyres than the Pzero, considerably better in cold wet conditions, which face it the UK is generally cold and wet a lot of the time. I will always go for Michelin and generally always MPSS or PS4S for their outright performance, but also because I like the fact they seem to last more than double the distance of competing tyres and generally cost no extra. I am aware their are now continentals with similar performance, but from the people I know who have had them, are now back in Michelin camp simply due to longevity being much better on the Michelins for no additional cost.