I recently got this lens on EBay and am asking this question since my curiosity has gotten the better of me.
I am currently on a self-imposed darkroom hiatus until my wife delivers our second child (expected around Sept 1st week), but I should be able to step into the darkroom for atleast brief periods of time by the middle of October. I will be making a comparison test myself once I get back in there.
In the meanwhile, I would love to hear your experiences with this lens especially in comparison with the El-nikkor 50mm F/2.8. (I have the older version of the El-Nikkor - the one without the backlit aperture numbers).