I just spent a half an hour trying to find an old copy of a comparative list of nutrients in temperate fruit but failed. I believe I copied it from an old issue of Pomona to use as a handout in a home orchard class. I remember that while kiwis were impressive it was black currants that were by far the richest in nutrients. Very high concentrations of potassium and vitamin C and A were among its assets. I expect that anti-oxidant flavinoids would be off the charts as well. I doubt kiwis are nearly as rich in flavinoids- not enough color.
Apricots are by far the richest temperate fruit in carotene, therefor vitamin A- I believe mangoes are comparable in this regard. Papayas also. I'm sure there are lesser know tropical fruits with a high level of vitamins and flavinoids.
[NAFEX] most nutritious fruit,
Alan Haigh, 06/14/2008