How do you like shooting that 24/2.8 N.C? I've been looking at that, or a 28/2 Nikkor-N to add to my Df Kit.
About a year ago, I did some comparisons of the 24s and 28s f2 and f2.8s thanks to a loan of lenses from Jack (MontanaKid). I had the 24 f2, the rest were Jack's. These were all AI or AIS lenses. I posted the results, but have since removed them from Flickr - so those will be dead links.
My application is for Landscape, so I was looking in the f5.6 - f11 range. I don't remember exactly (and would have to dig those up again), but I don't think there was much difference on the Df. Since then I got the 24 f2.8 NC and the 28 f2 NC (AI'd). I like the focus rings on the pre-AI lenses.