From the demos I have heard I agree entirely, however virtually all of this is down to the new DSP effect software that has been added to the T5, which really does put it way in front of a T4. (It should also force other manufactures to up their game as well which can only benefit all)
Bill
Yes, thats the main reason the new tyros sounds arenīt drowning in reverb anymore...
But some will say (and arguably they might be right) that this means that the PA3Xīs succes forced Yamaha in this direction, the new sound and a 76 key option..
For me the choice between PA3x and T5 comes currently down to a choice between being in full controll(Korg) or having tools that make you sound better withouth all the effort(Yamaha)