The newer G lens has a built in silent motor and will autofocus on any digital camera, whereas the D lens is the older model and wil only autofocus on cameras with built in screw drives, so autofocus will not work on the D3200 or D5200, or their predecessors.
I think the newer lens is even sharper than the older D lens, especially wide open and on the corners.
The older lens is something of a legend with the creamiest boke you could imagine, though I believe the newer lens is no slouch there either,
This review explains all this in greater detail....
A quick check of the Nikon lens comparison chart shows the following:
1/d is $340.00 cheaper, older than the 1/g, 3.9 oz lighter, 1 less lens element, 1 less lens group, no Nano Crystal coating, no Silent Wave Motor, but it does have an aperture ring if that's important to you.
Hope this helps.
Bob White San Francisco Bay Area (BWO Brooklyn, N.Y.)
I owned the "D" version before replacing it with the "G" version. My main (only) reason was to get improved AF speed and accuracy in low light, and I've not been disappointed.
I don't see to much difference in images from both lenses, even wide open. The "G" is perhaps a little sharper overall, but I always liked the "D" as well. Without knowing why you've not been happy with the "D", it's difficult to know whether you'd like the "G" any more.
You'll find an independent test with some comparisons here.
Thanks William and Brian. My 85 is in for service for the soft focus, so I will see when it is returned if this corrects for this. Brian- good points- and my desires too; faster focus mainly, I am a wedding and lifestyle shooter. I would like to add a 24 or 35 to my lens choices and begin to shoot more primes mainly. The 24-70 is a great all around lens and def. has its place in my bag.