Blender Cycles Hair Particle test

I have been experimenting with Hair rendering in cycles and I can say, that unbiased hair rendering can deliver extremely realistic and appealing images, see yourself…

I used a standard setup with randomly placed objects above a plane with a emitter cube, that I have been using in my other experiments (see link). There is another plane above the scene, which adds some indirect lighting to the scene. I also a turbulence force field to get the effect of blown-away hair.
Unfortunately Blender at Version 2.67 did not support GPU rendering of hair. ON my 4 core CPU it took a staggering 160 hours for a Full HD (1920×1080) frame.