I have the 85 1.4D and considered moving to the 1.4G but after using both on the D800, I started liking my D more more than in the past on the D7000. Both are very good and I decided the money difference would be better served used on something else. I've also used the 85 1.8D like yours and the 1.4D has a special look that is perfect for portraits and candids but actually has more CA than the 1.8. Technically the 1.8 is better in some measurements but finished images seldom depend on technical measurements. If I was using an 85 as a short telephoto stopped down a bit, I would probably select a 1.8G or a further down the list, a 1.8D. If I was using it for close work with maximum isolation, the 1.4D and G are worth the price difference in the "look" images take on. It is like that Sigma 50 1.4, technically has too many weaknesses to compete with the Nikon 1.4G or 1.8G for general photography but it has a "look", in the center that nothing else has. It's a wonderful portrait lens on Fx or Dx. Corners are not good but the center reminds me a lot of the 85 1.4 magic. So the best way to evaluate a specialty lens is the rent one for a weekend and experiment and forget the charts and measurements. If it is worth the price difference to you will be clear.
If price is the major factor, the 85 1.8G is a very impressive lens and a leader in the value/bargain contest. Stan St Petersburg Russia