I don't have a lot of experience with the 20mm f/2.8D but I have had some time with the Nikon 20mm f/1.8G and it's pretty damn amazingly sharp (and I mean corner to corner and even wide open) and fast handling. I'm not currently in the market for a wide-angle lens but when the time comes, this one will probably be at the top of my list.IF anyone had the pleasure of trying out both, what would you aim for? Main thing I'm looking for is AF speed, then IQ/weight. Longevity would be a nice factor as well and that's where G might be more of a miss unless it absolutely excels at AF and IQ in comparison.
Bigger IS better. 1.8
It's better to have it and not need it, than to need it........
If you shoot open then the g is sharpwr. If u shoot closed, 4.5 onwards then d is the better choice i think. Your options is for only these two options? Zooms are not a consideration?