Some people would like to hear the difference between the Vienna Imperial and the Bosendorfer Imperial, so I did a simple audio comparison with a chromatic scale. The Vienna Imperial track has all the velocities in the scale, starting from 1, increasing by one each note to 100. In the 2nd track, the Bosendorfer Imperial, the exact same track is played but using its own velocities. I hope this will help.
Vienna Imperial (close mic, no Eq): http://www.guybacos.com/audio/Vienna%20Imperial.mp3
Bosendorfer Imperial: http://www.guybacos.com/audio/Bosen%20Imperial.mp3