Gus, yes, I got that type of bokeh also with my J-9. I don;t know if I have a lot of examples uploaded, let me see...
By the way, incredible shots, especially that last leaf shot! So very pleasing to my brain, very, very nice!
Here are some J-9 bokeh shots:
not exploding gumball, but weird/pleasing (wide open):
This is just good bokeh, imo:
Wish I had more bokeh shots uploaded to show ya - I'll have to look through my images on disk to see if I find any exploding gumballs.
BTW, really, really impressed with what you can do with that Helios.
PS: Is that Cz Jena getting any use, or are you finding the action too tight still?
.