As far as I see, all the difference is here (comparing to FISA Suprema in italics):
Right Hand
PIANO: 37 keys (vs. 41) with velocity sensitive (no aftertouch)
BUTTON: 92 buttons with velocity sensitive (no aftertouch via Master Bar)
Left Hand
120 bass buttons with velocity sensitive
Standard and Free Bass mode
CONTROLLERS
Main Volume, Main Balance, DATA/ENTER, Reverb Level, Delay Level, FX-C1, FX-C2, 3 Chin Switches, Touch Sensor, “G” Sensor (no Master Bar control, Master Bar switch)
RATED POWER OUTPUT
70 W max (vs. 112 W max)
DIMENSIONS
PIANO501 (W) x 408 (D) x 273 (H) mm vs. 542 (W) x 408 (D) x 289 (H) mm
19-3/4 (W) x 16-1/16 (D) x 10-3/4 (H) inches vs. 21-3/8 (W) x 16-1/16 (D) x 11-7/16 (H) inches
BUTTON
469 (W) x 381 (D) x 253 (H) mm vs. 500 (W) x 381 (D) x 269 (H) mm
18-1/2 (W) x 15 (D) x 10 (H) inches vs. 19-11/16 (W) x 15 (D) x 10-5/8 (H) inches
WEIGHT
PIANO9.9 kg vs. 10.6 kg (excluding AC adaptor)
21 lbs 14 oz vs. 23 lbs 6 oz (excluding AC adaptor)
BUTTON
9.6 kg vs. 10.3 kg (excluding AC adaptor)
21 lbs 3 oz vs. 22 lbs 12 oz (excluding AC adaptor)
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