I thought this might be an interesting topic and what members here would regard the biggest update that a given manufacturer as made in their next model.

I've owned a few keyboards over the years including ones from Ketron and GEM but I am probably more familiar with Yamaha & Korg keyboard updates.

In Yamaha's case, I think Yamaha's biggest upgrade was from the PSR8000 to PSR9000 perhaps? I thought those two were quite different in many ways. Any other opinions?