4790K TO 5820K OR 5930K ? is it worth it ?



Only you can decide if an upgrade is worth it. If your PC is able to accomplish what you want it to do in an appropriate time frame then there is really no reason to upgrade unless it is the upgrade itch.
 
Definitely the Quad-channel X99 platform will be a better-performing one for a video editing PC.. In terms of approximate performance increase, a 5820K shows a 36% and the 5930K, a 50% lesser-time while encoding the same file as on a 4790K..

See this comparison: i7 5930K vs i7 5820K vs i7 4790K

You could also compare cpu performance depending upon the software suite application:

Tomshardware -- All CPU charts List -- 2015
 
Solution