I have uploaded on blendswap a simple cycles shader which you’ll find helpfulI if you are using some softwares like substance painter or quixel suite : just plug the maps and you are done !
Here is a comparison from marmoset website between those two workflows :
It can be improved, simplified if you need less features or complexified if you need more, you can do what you want with it as it is under CC0.
Here are some cycles renders made with models found on the net.
This post is also available in french.