I loved my P5s which I received just over a year ago. I actually bought a second pair at a discount. These P8's are much narrower than 5's. I'm sure they are great shoes. You look great. I'm not even sure if there will be a half size difference.
Pros
It has a 4mm offset that offers a natural and responsive ride, allowing the runner to run more efficiently.
Cons
The lack of a removable insole may not meet orthopedic requirements.