76 keys
Fsr keybed
Aftertouch
6 knobs
9 sliders
Bigger screen
Better buildquallity (despite being plastick, its build like a tank)
More connections
More sounds..
Sa2 sounds
Ensemble voices
Revo drums
3 types of drawbar organs
Huge amount of dsp effects
No build inpeakers (which to me is a pro)
3GB expansion memmory
3rd party expansions, many more then for psr series
Dual audio player
Better bigger and more buttons,

And probably a few more..