Hi Tracknet,

It seems to me you are over emphasizing the importance here of the size of the keys of the PA-50, all I can say is that they play quite comfortably.
As to the styles and sounds you remark that
"they are similar".
They are not similar, ALL sounds(as derived from the internal samples) and ALL styles are completely identical in all three PA keyboards (PA80/60/50) in as far as I know and have been able to ascertain.
Please note.
regards,
john