Nikon AF-S Nikkor 85mm f/1.4G

Manufacturer description: The Nikon AF-S Nikkor 85mm F1.4G is a prime lens designed for use on both FX (full-frame) and DX (APS-C) format Nikon DSLRs. A fast maximum aperture of F1.4 makes it very useful in poor light and for achieving shallow depth-of-field, especially in portraiture. As far as optical quality is concerned, this lens doesn't offer vastly better results than the cheaper AF-S Nikkor 85mm F1.8G (which is excellent, by the way), but the extra money buys you a stop of extra brightness, a 9-bladed aperture diaphragm, Nano Crystal coating for the reduction of flare, a magnesium alloy body shell and weather-sealing.