Excerpt: The Canon EF 85mm f/1.2 L II USM Lens is the widest aperture lens Canon currently makes (review update: the Canon EF 50mm f/1.2 L USM Lens now shares this aperture) - allowing handholding and action stopping in the darkest conditions. The background blur the Canon EF 85mm f/1.2 L II USM Lens is capable of producing is stunning .
Canon EF 85mm f/1.2 USM L II - APS-C Lab Test / Review
7 January 2009
Conclusion: The Canon EF 85mm f/1.2 USM L II is one of the little wonders in the Canon lens lineup - at least on an APS-C DSLR. The center performance is nothing short of breathtaking and the borders are only slightly weaker. There's a bit of vignetting at f/1.2 but from a field perspective it's probably not a real issue and from f/2 onwards it's not relevant anymore. Distortions and lateral CAs are extremely well controlled.