Phil,
This is what they say about the f/1.4:
"Finding a verdict for the Nikkor AF 85mm f/1.4D isn't easy. From f/2.8 and up the performance of the lens is superb and neither distortions, CAs nor vignetting are something to worry about. However, at f/1.4 and to a lesser degree at f/2 the lens shows a couple of flaws - the border resolution is "only" good, the level of contrast is reduced and the results show a pronounced degree of purple fringing at harsh contrast transitions and longitudinal chromatic aberrations.
That all said the AF 85mm f/1.4D is certainly capable to render beautiful large-aperture results with a shallow depth-of-field and an exceptionally smooth bokeh. The mechanical quality of the lens is fantastic and it is a joy to use this lens. Whether the package as a whole is worth the steep price tag is a personal thing."
And the f/1.8:
"The Nikkor AF 85mm f/1.8 D was a very boring lens during the tests simply because it showed a exceptional performance in all tested categories. Besides the lab results the lens shows a beautiful bokeh (out-of-focus blur). If I had to name a weakness it may be flare in contra light but it is a minor issue in the otherwise very harmonic package. So if you´re looking for a portrait lens or a similar application where you would like to isolate an object from its environment this is an ideal lens. Highly recommended!"
Gimpy,
I don't particularly want to get into a discussion with you regarding my ability to afford the f/1.4 or not. Even if I cannot afford the steeper price of the f/1.4, I may be better qualified to comment regarding photographic issues. Your ability as a photographer is not described by the price of your equipment.
But as you say, the proof is in the pudding and if you haven't owned and used both, how can you tell? In the abscence of that experience, scientific test results (with added comments by experienced testers) are a good reference if you can understand it.
Maybe somebody with lots of money, who own both lenses, can show us some side-be-side results (please not taken in the backyard

to prove the better results of the f/1.4.
OK, OK - I did want to stir a bit, so feel free to hit back. I have a thick skin
--
Chris J
D300 - since 16 Dec 2008
Nikon 70-300 VR
Nikon 50mm f/1.8
Nikon 18-70 kit lens
Sigma 150mm f/2.8 macro
SB800 flash