My conclusions

1) I enjoyed very much the discussion on this topic.

2) Test Result: FAILED.
The Reason: I used Pa500 styles and sounds and it sounds the same in a superior model.

3) Possible tests to try:
a)compare new original Pa3x styles/sounds and standard Pa500 styles/sounds independently.
b)compare Pa3x styles/sounds played on Pa500.
The Result: Sure to FAIL
The Reason: inappropiate Master EQ settings, improper volume settings, recording problems, inadequate style/sound comparison, etc...

4) Nobody changed their minds: Pa500 and Pa3x owners are very happy with their choice. Everyone has a reason to think so.

5) A final thought: Let's say you close your eyes and ask to be driven blindfolded in a regular car for a short trip in the city. Do the same in a Lamborghini and don't touch anything. You'll get to your destiny in both at the same time and you'll probably feel a 30% more confortable in the second car. Now open your eyes and say what you think.
The pa3x offers much more than sounds.