S5 prices are on freefall, the touchwiz is a lag god. I would any day pick G3 over S5. Even in blind camera test in phonearena, S5 just finished 3 votes ahead of S5. So camera re identical, now look at better things, Bigger and the latest screen tech. Almost same weight(145 vs 149), more ram (3 gig vs 2 gig). S5 has finger print scanner which hardly works, the waterproofing is nifty though.
Lookwise G3 looks way better then S5, with S5 you never know if it is a grand or what.