Wow, guys, I didn't realize there were so many that had soft picture issues with their P3s. Sorry to hear that.
I have seen 2 different issues posted regarding lenses that were soft in one area or another and one was fixed by refocusing the lens and the other was fixed because the PCB holding the sensor was not seated with one of it's 4 screws. In both cases the user was able to fix it, Albeit it required taking the camera apart, but it wasn't that difficult.
I hope those of you that had problems and are moving to the P4 get better results. If the lens is dramatically better, then perhaps I'll have to try and source it and retrofit my P3s! It likely will be the same thread size on the barrel and we already know the sensor is the same.
I've never really had a problem with chromatic aberration because LR is so good and quick at removing any. Always better if it's not there in the first place though.