FX 8150 looses to the I5 2500K in most tasks, those that use all 8 cores properly in which it actually out performs an I5 2500k, it than gets beat by the I7 2600K. Dual Xeons would crush an FX 8150 for video editing.
AMD failed with the FX line, IPC is lower than Phenom II, making it lower than Sandy Bridge, Nehalem, and even Core2Quad. They increased the pipeline with idea of having high clock speeds, than failed to clock higher than Intels Sandy Bridge while consuming far more power. There is some hope the architecture can be improved upon, but right now it's EPIC fail.