The guys from Moto.IT have done a on YT.
Unfortunately, all in Italian which I do not speak - also Italian subtitles. If anyone knows how to enable English or German subs, please let me know - the guy talks a lot, and I was hoping for some more insights.
But interestingly, there are quite some shots (like 5:12) where you can hear the new drivetrain accelerating.
I‘m not 100% sure with the old engine, but with the new one you can see in pictures that there is an intermediate shaft in the gear box. Having that in mind, I think I can hear a subtle difference when comparing the EMCE-equipped Ribelle in the video compared with my Ribelle build September 2020. However, overall it is more or less the same sound. Not the huge difference I was hoping for.