The Nikon AF-S Nikkor 58mm f/1.4G was one of the more unexpected lens releases of 2013. It's a fast normal prime for full frame shooters, but its $1699.95 / £1599.99 price tag represents a huge premium compared to the existing (and very good) AF-S Nikkor 50mm f/1.4G. What's more, lab tests failed to show any clear sharpness advantage either. So why, exactly, is Nikon asking so much for this lens, and just how well does it perform in real-world use? Read our detailed review to find out.