For those of you with a Galaxy S3 GT-i9300, you are in luck as S5 Sensations ROM by XDA user Sunajkram23 brings you a real “S5 port” to your Galaxy S3.
Inside S5 Sensations, you will find goodies like native call recording, modded S5 launcher with theme support, Ultra Power Saving Mode (Yes get 10 days of battery life!), S5 lockscreen effects, quad multi-window, and much more.
S5 Sensations ROM also ships with practically every S5 app, which you can customize with its AROMA installer so you don’t end up with a ton of bloatware you don’t want.
And yes, you can even try the S5 camera (only still camera works, other features are broke) which works well for regular still photos. (But I do recommend using S3 camera for daily driving.) For themes, you will be able to get over 20+ themes and easily switch the look on your S3 to an LG G3, HTC Sense, Xperia, iOS, MIUI, and much more.