This lens is a legendary lens, and it's nothing more than that.
Wide open, it's hazey, and there's lots of halos. The D-series AF/MF clutch by today's standards is just nuisance. AF speed isn't fast but certainly snappy and acceptable.
The main problem is its price to performance and sample variations. A clean copy can cost up to $4000+, why? The 28/1.4E is superior in every aspect... maybe not the looks? I really love the looks of full metal pro D-series lenses, one could argue it's built better. The 28/1.4E however should be reasonably sealed against weather.
But then, there's another issue -- do you really need f/1.4?
The f/1.8G is also really good, and costs about one fifth used.