Its sounds good, but when did you hear a bad or ugly arranger for the last time, must have been 2 decades ago or so..

All TOTL arrangers currently sound top knotch, thats why i am mostly looking at the features... and when looking at the features of the pa4x, there is 2 thinks that make me kind of sad so far..

Only 400MB sample ram..
Only 1 IFX shared by the 4 keyboard parts

But soundwise these youtube videos seem to indicate that the PA4x made a step up from the pa3x.. with bigger samples and a new guitar and a new drum mode..