My airplane is all Skyview system, w/mode s, squawking 1200, orther airplane took off 2 or 3 minutes after me and passed by, up to 5 miles ahead, reversed course. We are flying out of P52, 90 miles north of Phoenix, AZ. I was seeing trafic from P52, sez, and prc. Altitudes up to 9000 msl for...