A good number of DA lenses will already be unusable (without some auto-crop), and it's really anyone's guess how well legacy K glass will perform. Much of it has been less-than-stellar on APS/C, and FF would potentially be somewhat worse.
That depends. A 24-megapixel FF would have significantly lower pixel pitch than a 24MP APS-C sensor – even a 36MP FF has slightly lower pixel pitch – so both should theoretically be less lens-critical than 24MP APS-C.
That's true Mark, but I would also expect the increased angle of light caused by the FF circle to be a significant issue with lenses not designed for digital?
I may be wrong though. I guess it's not difficult to see how that's worked out for Nikon FF with older lenses, it's unlikely to be significantly different.
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