The latest benchmark warrior, dubbed SM-G900H, features a "merely" 1080p 5.2" display, and doesn't seem to run the new Exynos 5422 processor that Samsung announced at the MWC. Now, Samsung has been releasing Galaxy S flagships with different processors from the dawn of its Android portfolio, mostly announcing Snapdragon-equipped gear for the US carriers, and Exynos-based international GSM versions, so that might be the case here still.
What about Samsung's speculated "luxury" F-series, though, timed to appear after the HTC M8/All New One announcement? On last count, there an eventual Galaxy S5 Prime, or whatever it gets named, is supposed to feature a 5.25" Quad HD panel, instead of the 5.1" 1080p one of the Galaxy S5 that was announced at the MWC.
Samsung is apparently toying around with many different variations of its 2014 flagship, as usual, so we wouldn't put much thought into it, until more tangible leaks around the mythical "luxury" series of metal-clad handsets from Samsung appears. The latest rumors peg its announcement for the end of April - beginning of May, so hopefully more water will be poured in the rumor mil until then.
source: GFXBench via G4Games