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if im not making my living with the stuff is the sigma passable?
I would say yes but i haven't used the sigma,
If you are considering a sigma, maybe you didn't need but rather wanted the d800? That is my case too. I do not make money from my camera and I wanted the D800 badly. If I were you I'd rather grow slowly on the lenses rather than pair it with a lens that might not give 100% to the sensor.
Cameras come and go. In 6 years your 800 will be super obsolete and there will be a new uber ultra Dxxx. But lenses stay. Lenses are for life. If you ask me, lenses are an investment for a hobbyist. Bodies aren't.
I would consider the sigma if it was optically superior. If not, why did you get the D800?
I could be wrong and the sigma might be optically superior. I'm not sure. Anyhow, the vr2 is the cream.