The way I rooted my stock 4.3 Optus (with Knox)
I used the cf root recovery that you flash through Odin. Once that's done and you reboot you so don't have root because of Knox. Go to app store and update SuperSu.
From there open SuperSu and it should now ask if you want to have Knox disabled. It worked for me. Then use titanium and delete or freeze all Knox related rubbish.
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