I am getting more interested in portraiture, and my current lens lineup is somewhat lacking. I am looking for suggestions for a lens to use on my D600. The Nikkor 85mm f/1.4 catches my eye, but I am sure there are others. I would appreciate any advice.
85mm f/1.4G or D
85mm f/1.8G or D
The AF-D versions are sharp in the center and softer in the corners and edges than the AF-G versions. I think they make better portraits, but aren't as versatile all around. The 1.4s have 9 blade apertures while the 1.8 have 7 so theoretically the brokeh of the 1.4s should be more pleasing, your mileage may vary. Personally, the 1.8D is the best bang for the buck for portraits. The 1.8G is a great all around performer for the money, but the 1.4G is still optically the best of the bunch.
105mm and 135mm DC lenses are specifically designed for adjusting the out of focus areas on full frame.
180mm f/2.8 is a good lens for getting some working distance for more candid shots. 25 years or so ago when I first started John Shaw and Bryan Peterson books got me going. Peterson was hard over on the 180mm f/2.8 for street portraits because of the smallish size and good working distance.
70-200mm f/2.8 VR II - This is an odd ball pick, but because lots of people have this in their kit already, I will offer this choice. It is a little big and unwieldy, but still usable. Remember, the original 2 version of the 80-200mm f/2.8 lacked a tripod mount and were considered photo-journalist lenses. Because I have it with me a lot, I use it for portraits a lot. Works great on DX format even. The VR can assist to mitigate camera shake due to length.
24-70mm f/2.8 - Again this is here because if you already have it, you might as well use it. Not quite as long as one might choose on full frame, but still nice portraits at 70mm.