I especially liked Andreas Gundlach's Korg M3 demos. I don't know if he still works for Korg and if he has done English language demos, too.
Here's his version of "Isn't she lovely", purely on e-piano without anything else - impressing skills.

It shows me up my limits... a lot to learn for me in terms of chord sequences and jazz improvisation.

Two cool M3 demonstrations by Andreas Gundlach (first one unfortunately a bit distorted):

I don't know, hope I'm not the only one here who is impressed by his skills. These crazy improvisations and complex chord sequences... Did you see him play the drums on the M3 keyboard in the bottom video at 4:55?

BTW, meanwhile he also has shows on his own account being on tour as a music cabaret artist.

No Rosetree you are not alone in your regard for Andreas gundlach . He is an amazing player and I don't know why korg do not use him more. His skill level is at the very top in Thames of being able to play and his creativity and technical prowess in getting the most from workstations all ranges are 2nd to none. Here are some clips of him in concert https://vimeo.com/103820775