Question: must have fx lenses for nikon?
Answer: Nikon 24-70mm f/2.8E VR ($2,397) ... 
Nikon 50mm f/1.4G ($447) ... 
Nikon 14-24mm f/2.8G ($1,897) ... 
Sigma 35mm f/1.4 Art ($899) ... 
Nikon 70-200mm f/2.8E VR ($2,797) ... 
Nikon 85mm f/1.8G ($477) ... 
Nikon 50mm f/1.8G ($217) ... 
Nikon 28-300mm f/3.5-5.6G VR ($897)