First of all the Cryengines uses LPV as their Realtime GI solution which just supports sunlight. As next, the UE4 offers much more control over the LPV than the Cryengine does. And last but not least, developing features like that take time and where often build upon the work of others. One comes up with a technique another refines it until WE have a acceptable solution. Sorry if i sound a bit angry but constant engine war ******** is annoying as ****. kind of competition blocks progress instead of encouraging it.