A few thoughts : In this circumstance there won't be a huge difference to a FF over P4 render ... because the rendr engine doesn;t have to work that hard... It DOES however show that FF is more than capable of doing dynamite work on skin textures. But there is much more to it that may or may not be part of this image: 1) One can do much more with shin "sheen" and shine. 2) One can use color fallofs to make the skin tone much more realistic thatthey would be in other cases 3) FF handles bum/displacement mapping better in the final render, allowing for more detail 4) I think dunamic hair eyebrows would rock :)