Everything is bigger in Australia! The Texas of Oceania?
I have a seedling starfruit tree that has huge fruits, not quite that big, but very close. Yes the big ones tend to get more wavy fins.
We have so many thousands of these fruits we don't usually pay them much attention. This year the crop was unusually large. Dried a bunch and they were incredibly good tasting, much better than usual. I think this was first year they got some fert. and they really rewarded me for that extra TLC.
I also made some starfruit chili sauce that was very nice! As well as the usual gallons of juice. There are still a few fruits on the trees. So a full 4 months of starfruit birrage!