Unwired View claimed that there's simply not enough time for Samsung to mass-produce a 14nm chip.
That's because, as we've heard before, the Galaxy S5 release may be set for January, moved up from the previously expected March release for the S5.
The Galaxy S5 might still sport a 64-bit CPU, but the site said mass production of 14-nanometer chips is still months away.
Galaxy S4 vs iPhone 5
The Hong Kong research group said the S4 was the top-selling phone in August, though for some reason it counted the iPhone 5 16GB and 32GB models as two separate phones.
The two iPhone versions took the second and third spots on the list of top-selling phones that month, so combined they likely beat the Galaxy S4.
Mobile market on the rise
However, despite the new iPhones on the market, Galaxy S4 sales will likely rise as the holidays approach thanks to price cuts and promotions from Samsung.
Overall, the mobile market is growing 40 to 50 percent year over year, the group said.