It's my standard lens on the D3. Sharp in the center, bit of falloff at the edges wide open. If you're considering a used copy, older versions suffer from oil on the aperture blades (not sure when this was corrected). It's not IF, which makes it a bit cramped to hold if you use the vertical grip.
Great lens. Used it for years until I got the newer 1.4 version. Solid performer. As stated check for oil on the blades but I did a quick google fu and found out that it's an easy fix if you're handy with a small screw driver set.
I have one and like it. It's not the greatest lens but does everything I want it to do. A lot of reports of it being very soft at wider apertures and corner sharpness being unacceptable but i've been plenty happy with both aspects (I typically don't care about corner sharpness because, well, it's unimportant).
I had a 35mm f/2D for a couple of years and really enjoyed it. Performance wise it can hold its own but I found I'd always have to stop it down to 2.8 or so for better results. I loved the size, it was perfect for when you didn't want to have a larger lens. In the end I replaced it with the Sigma 1.4 and haven't looked back (the Sigma hardly ever comes off of my camera, the size is a trade off but it's not that big and considering the results it gives me it's a trade off I'm more than happy to make). Price wise you can't beat the 35mm f/2D and it would be right at home on your D600.
Good lens. I had it for a while but didn't like the focal length.
It's a perfect example of how internet frenzy can overblow a problem. The oil on the aperture blade issue was solved by the time the D version came out. It was very popular and the "forgotten IT lens of the moment" from about 2008-2010. Then people started the internet claims of, "not as good as the Sigma 30 f/1.4," and, "The newer Nikon 35 f/1.8 (DX) and 35 f/1.4 (FX) are better."
Well I tried the Sigma 35mm f1.4 v the Nikon 35 f2 and I've decided to keep the Nikon for now, for travel its a better size and its cost me much much less (£200 used), I will buy a Sigma at some point but later in the year as a rationalisation of my 20/24/35/50.