I just got my new D700 today and am trying to decide which lens I want to add to my arsenal. I know only I can make this decision. I could use them both and want them both, but can only afford one right now. I don't have a long lens or anything wider than 24mm. I currently only have to lenses a 24-60 Sigma 2.8 and a 50mm 1.4. I know the 14-24 is excellent with the FX sensor. They would probably get equal use. I would use the wide angle quite a bit, but the 70-200 would be great for outdoor photos of my son and dogs now that it is summer time. My question: Does the 70-200 work well with the FX sensor? How is the Image quality? How about with a 1.4-2.0 TC?