Talking to many dealers in the UK then yes, the PA4x has outsold the T5 by 2 -1, much like the Technics KN7000 did to T1, however the T5 sales have been lacklustre, (Many ditching them and going back to T4 or other manufactures) the bestselling was the T3 which built on the T2 which at the time put all the other arranger manufactures in the shade.
There were some problems and missing features in the T3 which were fixed by the T4, however a lot of folks still stuck with the T3.
If you go into any dealer or festival, you will find most folks are interested in the S970 and a used Tyros. (The T5 gets pretty much side-lined these days, with no firm commitment as to when a replacement will arrive either)
Bill