If looking at the Iskra, the Super Ikontas would be a step up. But from the completed listings on ebay the Zeiss option isnt that more. they seem to range from about the same price, to more than double the price of the Iskras so there is a possibility to score on cheap.
Honestly if you look at their pictures, it seems the Iskra is a clone. Though I cant say for sure as I dont know their history.