For a start post in the right forum and not fully sure if comparison threads are allowed.
But I will answer your question anyway. The only thing you'll miss is the huge screen and S pen if you even use it. Otherwise the S5 is superior in every way.
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Top reliable phones I have had: HTC One. LG G2, Nexus 4, Note 2, Nokia 5800, Motorola RAZR V3X, Motorola RAZR i, Nexus 5 Had many more, but these devices were the best IMO.
Current Phone: HTC One M8
if i helped you, it's nice knowing when you have helped somebody out