"The Zeiss ZA 85mm f/1.4 produced highly impressive resolution figures in the MTF lab. At f/1.4 the quality is already exceptionally high for such a lens with very good resolution figures across the image frame. The contrast level is also very snappy here. There's an additional boost in quality from f/4 onwards and the outstanding quality peak is reached at f/8. Field curvature is not an issue."