In my perception the Tyros4 is a real collector's item. It was/is the best of the entire Tyros' serie, IMHO. 
Hard to let it go ... I have no intention at all. 
Best regards, JH
Never owned a T4, but love my T5
What does T5 offer to a T4 player
- 76 keys, if you prefer wider keybeds,
- better DSP..
- organ world.... The best organs in an arranger, especially the church organ
- 3 times as many SA2 voices... And many more other voices
- some new styles (50 )
- ensemble feature, very innovative and loved by advanced players
Its the best Tyros arranger keyboard ever made... ( in my opinion ) Each to their own Jeff
But we are going off topic this is about Genos
I'm ready for G2 are you Jeff?