I tend to use Mental Ray and GI to achieve my soft shadow renders. I've known about light tracer for some time but haven't ever used it since I feel MR + GI does pretty much the same kind of thing.
What differences are there between the 2 rendering techniques, and is there much of a speed difference between them, do you know?
Nice tutorial. I think I might have a go with Light Tracer from the quality of your render.
Cheers!
G