Overall sound sounds about the same to me. Yamaha has too busy styles, so the overall impression is the same.

Midifile playback.. well I didn't try to use SA sounds in replacement, and I don't know if that works. If not, well then I think it sounds the same.

I did'nt try the vocalizer, I don't use it.
I use Digitech Performer.

The drums, Power Kit sounds good.

I hope next time Yamaha brings something new like wav/loop synch, chord extraction, auto follow lyric, midi or wav, even mp3, and some gutsy styles with air, punch and less quantizised.