D800 ... Replace 24-70 with 28, 50, and 85 G 1.8's?

It's an amazingly sharp and versatile lens. If you want an 85mm, get it, but I wouldn't let go of that amazing zoom.

FWIW, I've got the 24-70, a 50mm, 85mm, 105 micro, 70-200 II and the TC-200 III. The worst quality is when the TC is attached to the 70-200. Otherwise, they're all excellent on the D800.
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david