"I've been noticing that the P6 Firefly renders appear more like paintings because of this bleed." Changing the kind of post filter type you use might help increase overall sharpness. Box is probably the worst to use, and gaussian is best for animation, but many people don't bother to change it from the default. All my final renders, for instance, are done with sinc, and I think they come out quite detailed and sharp.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.