Here are the main differences as described in the P4P FAQ:
The Phantom 4 Pro redefines the iconic Phantom series, bringing imaging and intelligence to new heights. Its uprated camera shoots 4K/60fps at a bitrate of 100Mbps and stills up to 20-megapixels, creating dramatically better images. The FlightAutonomy system adds dual rear vision sensors and two Time of Flight range imaging cameras for a total of 5 directions of obstacle sensing with a range of up to 30m in all directions. The upgraded Lightbridge HD video transmission system offers an extended maximum transmission range of 4.3mi (7km) and also enables you to switch between 2.4GHz and 5.8GHz. It can also be used with an optional integrated monitor for even more reliable transmission. Operators are also further empowered with a new suite of ActiveTrack and TapFly functions. The aircraft’s Intelligent Flight Battery also have increased capacity by 520mAh to enable an extended flight time of 30 minutes.
Thanks for all your input and the comparison video! I think for what I need it for the Phantom 4 is going to serve me well once I weigh the cost difference and so on. I would have really liked to had the better camera and more sensors. Being totally new to this I'm sure I'll have lots of questions later, loving this group already!
Everybody parses the cost/value equation differently, but I can't envision not getting the Phantom 4 Pro if the thing is going to be used in any kind of photographic endeavor. When you add in the more advanced Lightbridge technology (better range), the enhanced flight modes, and the likelihood that other subsystems in the drone itself have likely been improved (but not necessarily advertised), I think that returning the P4 for a P4P is an obvious choice. As I see it. From my perspective. I don't think there's any question that the P4P is a better, more capable drone. Whether or not its significant improvements are worth the extra $500 to you is a decision only you can make. That certainly are for me.