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Definitely change all 4. I changed from P Zeros to PS4S on my previous car and I was far happier with the PS4S. Didn't seem to be much in it on hot, dry days but whenever there was any kind of moisture the Michelin's were far superior and I experienced far less wheel slip. This was on a FWD car with 300bhp so it really didn't take much for the car to break traction, just trying to pull away from a roundabout was sketchy with the Pirellis!
Go for the Michelins.
ElGonzo-
Just weighing up the differences, it's for a 410bhp estate which I do occasionally load up.
As far as I can tell reading all the reviews... there's just no real difference.
If I go for the PNCS version of the PZ4 I can get it down to 68db of external noise and far less in the cabin.
If I go for the PS4s I can apparently get more comfort from the drive.
I think I'm going to go for a Y speed rating regardless, as it's done 144mph and I would like to have more peace of mind that the tyres are fine with speed, so raising the performance beyond what the car could do is nice.
There are no mobile fitters via Black Circles, so might as well shop around for price.
Velocio
It's more:
Tyre 1 🔴
Tyre 2 🔴
Tyre 3 🟠(red soon, maybe another ~1K miles)
Tyre 4 🟠(just gone amber, maybe another ~3k miles)
I'll replace all 4, and will weigh up either keeping the Volvo specific ones, or Michelin Pilot Sport 4 S.
The reviews basically say that they're neck and neck on everything, with Pirelli barely beating the Michelin in the wet and being fractionally quieter, and the Michelin having a better subjective feel and comfort to drive but being fractionally louder. All reviews acknowledge that as they're both the very best in their class there is virtually no difference between them and it's just personal taste.
The Pirelli are £235 per tyre = £940
The Michelin are £290 per tyre = £1,160 but with a 10% discount on Black Circles comes down to £1,044