I think the main difference w/ the G lenses vs the older lenses is that Nikon crippled them, and you have to use the camera to adjust aperture, not the lens. They are also cheaper made, at least the ones I owned. When it comes to image quality and good construction, a good rule to go by is that older is better. I have an old non AI Nikkor H 50 2 lens that easily blows away the AF-D 50 1.8 lens I used to have, w/ the latter showing very rough bokeh. About all I could say about the newer lens is that it had AF and more contrast (too much). There's a reason why people are putting older lenses on their newer cameras. Few people are putting newer glass on their older bodies (even if they would work w/ there being no way to set aperture).
The 35 70 2.8 I owned was a good lens. Bit limited on the focal range, and quite heavy and bulky, but I got some good shots from mine. Bokeh wasn't great.