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Nikon 16-35/4 VR and 17-35/2.8 (not to scale)  
Nikon 85mm f/1.4G

Modulation Transfer Function (MTF)

Please refer to Making Sharp Images for discussion and examples of how to read MTF charts, as well as the very real issues of build quality and testing for a bad lens or camera.

Performance wide open at f/1.4 is outstanding. Large structures are rendered with very high contrast at f/1.4, and fine details are rendered with a contrast not achieved by some lenses even at f/8.

There appears to be little field curvature, and only a modest loss of sharpness at the corners of the frame, a remarkably consistent corner-to-corner performance. Field shooting suggests a mild rearward curvature starting at the edges and increasing to the corners (objects at a further distance in the corners than the center will be slightly sharper than expected).

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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

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Nikon 85mm f/1.4G MTF
MTF for Nikon 85mm f/1.4G @ f/1.4

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