I won’t be embedding examples here because of size limitations but linking to them for you to see and make up your own mind. When an NSFW warning is needed, I will flag it.
The technique:
Is basically simple: (huge props to sigstan

Example 1:
A very heavy scene: G2F, HiveWire Horse, HiveWire BigCats have all been subdivided to 3 in D|S and with the exception of the leaves and small rocks in the scene, everything else has had displacement maps and subdivided into 2, on the average, in Reality. It takes LuxRender about 10 minutes to load the file.
Rendering time and resolution: 10 hours to reach 13 k s/p, with network rendering and overexposure to 6400 while rendering.
Example 2 (NSFW):
One G2F figure and SAV Mitchel Hair, each subdivided to 3. Light comes from Fuzzy70’s SingleIBL and Reality Mesh light provides a backlight.
Rendering time and resolution: 1.5 hours to 6-ish k s/p on one day, another 1.5 hours on another day for another 6-ish k s/p and an additional hour on another day for a total of 13k s/p with network rendering and overexposure to 6400 while rendering.
Example 3 (very, very really uber NSFW):
4 G2F figures with Mitchel Hair, each subdivided to 3 in D|S, light from Fuzzy70’s SingleIBL and a mirror floor.
Rendering time and resolution: 8 hours to reach 33K s/p , networking rendering with no overexposure

Near as I can make out, the combination of CPU-Acceleration and Power Light Strategy should be 3 times faster than CPU-Acceleration alone. On the average the rate is 5k s/p every 1.5 hours. YMMV
As always, this should be considered a starting point