I've had my 35mm f1/4 for about 5 months now. It's the Nikkor-N version and had a bit of yellow due to the thorium decay but I was able to reduce the effect with a UV light. I am very happy with it and it is pretty much my standard lens now. It loses a good bit of contrast wide open and it's lost about a half stop of transmission due to yellowing but it is probably my single favorite lens just due to the character of the shots. Here are a few galleries with shots using the lens: