ue4 is just ue3 with better graphics and an easier editor but is it worth the learning curve it has no unrealscript
Even if you don’t care for better graphics or an easier editor it is still definitely worth the learning curve (which isn’t too steep btw) partly because Epic are no longer supporting UDK but mostly because of all the new amazing features, amazing third party libraries, full source code access and available deployment platforms.
but you get no free facefx or speedtree and facefx studio is like £860