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I can confirm, the sound has more details, it sounds nicer, the sound flow and plot is better, the FX is better reworked. SET banks are excellently set up.
The sound is improved. Of course, new sound samples. You have the opportunity to beautifully create your own favorite sound

for me, the pa5x isn't even a consideration at the moment. the PA4X is an absolute beast if you know how to exploit the full potential.
I've owned my PA4X since the very beginning and it's still going strong!

Some styles I've made on the PA4X:

https://youtu.be/JaiVPTdD08c
https://youtu.be/8ZhWT_ICuVE
https://youtu.be/c_mycdloDvE