<p>When I had the D700 (now it's a D750), I bought a used 35 - 70mm f/2.8 and a 24mm f/2.8. The zoom had a very good optical quality, pictures were sometimes flat with a soft haze. This could be easily corrected in RAW-processing. I did not like the push-pull mechanism as I felt it quite hard and not sensitive enough for small corrections of focal length. I sold it for about the same price as I had bought it before I got the D750. So I cannot rate it on the new body. I now have a 24 - 70mm f/2.8 which has equal sharpness at the most but much more disortion. The 35 - 70mm is virtually free of distortion, but a bit prone to flares.<br>
The 24mm is optically okay on the D750. I take it when I want it light, in combination with a 35mm DX (yes, it works on FX with slight limitations), a 50mm f/1.8 and a 70 - 200mm f/4</p>