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Mine underexposes as well, not a full stop though. Outdoors I like to dial in a little negative EC anyway and pull up the image with the 800. I like the 24-85 as a hiking, go anywhere lens. Plenty sharp stopped down a little and distortion appears to be fairly mild at 24mm.
NIKON D800E 52 mm f/8.0 1/800 sec 100 ISO -0.7 EV
NIKON D800E 45 mm f/8.0 1/400 sec 100 ISO -0.7 EV