After serving me for a couple of years and producing some of my favourite pictures, I have decided to sell my Nikon 50mm F1.4 AFD to get the newer 50mm F1.4 AFS last week! Initial impressions of the AFS as compared to the AFD were slightly slower focussing(not really a problem for me) but higher accuracy(important especially wide open where DOF is paper thin!) and hence higher hit rates per shot! Optically wise they are very similar, from the initially impression I got, just maybe a little bit sharper and with less chromatic abberations... All in all, its a worthy upgrade if you use the 50mm range a lot like I do. Stay tuned in the future for some image samples. Cheers!