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I'm probably around 50-60% "spot on focus" with apertures 2.8 and wider, where as if I had used a smaller aperture, I'd be closer to 80% spot on.
I use AF-C, single point, obviously no re-compose with that. I've found recomposing with this lens makes it REALLY hard to keep focus especially when you are shooting 2.8 or wider. I use AF-C to force myself to not recompose when I use this lens.
No major contrast issues here as long as the light is good. But when the light is bad, this lens won't do you any favors.