any website for comparison on the performance like handling,noise,comfort? Thanks

In this case, forget about the P4 and just get the latest iteration the P5 (Primacy 5). Got this in early June and have been very satisfied with it ever since. Have chalked up 5k km mileage so far.

It lives up to its advertised promises of being fuel efficient, silent and supple ride etc. It is noticeably (albeit not significantly) quieter than VP4 it replaced. And VP4 itself is very quiet to begin with and P5 trumps it hands down. P5 also seems to have "padded" feel when going over those rumble strips, and it is significantly better than VP4.

On handling front, it seems to have a harder sidewall than VP4. Both P5 and VP4 are/were pumped to 240kPa cold. On my usual corners, P5 feels slightly more confident going through. Braking feels the same on both P5/VP4. Wet condition? Haven't been raining much lately due to dry season, so can't comment yet.

Finally, issue of dollars&cents. P5 is obscenely more expensive than VP4; 410 vs 240. Prices from same dealer. The only reason I was willing to give a go was I could offset (mostly) the cost difference thru 4% more fuel efficiency and longer thread life promises. The car using P5 piles up mileage very fast, so these 2 factors matter a lot. So now keeping fingers crossed for P5 to deliver on its promises.