One major difference between 'Prime' and 'Standard' is under the hood. The former will feature a 32-bit octa-core Samsung Exynos 5430, made using a 20nm process. The latter will be powered by a 32-bit quad-core Snapdragon 800 CPU, produced using the 28nm process or a 32-bit octa-core Samsung Exynos 5422, also manufactured with the 28nm process.
Another difference is with the screen. While both versions have a 5.2 inch display, the 'Prime' model has a resolution of 1440 x 2560, which works out to a mind blowing 565ppi pixel density. The 'Standard' screen carries a resolution of 1080 x 1920 for a pixel density of 423ppi.
The rest of the specs are the same across the board including 3GB of RAM, a 16MP rear camera and a front-facing 2MP one. Both models include the fingerprint scanner, 3D Gesture Support, and a 2850mAh battery.
Will Kuo prove to be as good a forecaster for the Galaxy S5 as he was for the iPhone? That won't be known until Samsung takes the wrapping off its new flagship model, which could happen as soon as next month.
The Samsung Galaxy S5 specs according to KGI's Kuo