Hi Brian
Yes, ver 2 made many significant improvements to the PA4. More styles, more voices, better OS, KAOSS, style converter improvements. A major update freely available to download from the KORG UK website.
Further to this, we now have ver 2.1 available for download, AND 'OSIMO' (many great songbook entries created by pro players like Pete Shaw on the PA4) these are complete sets of styles/registrations that can be used at the press of a button to set up the whole sound of the PA4 instantly. These sounds cover the whole musical genre, and can be easily located.
All of this and more can be downloaded free from the KORG UK website via a USB stick and uploaded fairly easily and quickly to the PA4 following the instructions provided.
I am very happy to own the PA4x, my high expectations in both sound and quality have been exceeded