FransN,
No I have not yet...but I plan to.
Quite honestly with the music I play I would be quite surprised if the Orchestral sounds were even close to the T4.

The PA2 had so many problems with the sounds I really got frustrated......3 pages of detailed issues sent to Korg, no answer.
If, only IF they used all new smaples will it be different. EQ, and DSP will not fix these problems.....but I will see if any ever show up here.
I have YET to hear a demo or performance that shows any real Orchestral sounds in a way I can evaluate it. DID you even listen to the performance I linked in my post for 'One reason I am going for the T4) ??
If not go listen to it...and then show me anything close on the PA2 or PA3.