My 1st arranger was a X4500 ( PSR4600) and there are some things that I have liked about Yamaha. I miss the dynamic arranger feature.
I guess it all goes back to what sound you like and Yamaha hasn't been what I want.
I think 76keys has more versatility.
I am not an Audya owner. I still have my SD1 at home and a SD1plus at my Church. I will get an Audya one day, but waiting for the OS to stabilize.
So when I talk about being spoiled, it really is just my opinion of what I like sound wise.
Yamaha doesn't sound authentic. Until Friday !