I think it would be very difficult for the tyros 5 to improve in a major way on what it already does so very well . The only thing that might tempt me away from my pa1x that I have owned for some 8 years now is a proper onboard sequencer . I think sonically the tyros 4 replicates real instruments incredibly well and I have no idea what yamaha have up their sleeve this time around . This is a great time to be an arranger musician !