"Extremely sharp, and it feels like a 'real' lens. I am using it for street photos at the moment, and its fairly challenging to pull the focus correctly, but once you get over that its great."
"The corner to corner sharpness and microcontrast is simply amazing. Construction is top notch. Manual focus is smooth and satisfying with my eg-s focus screen on 5D mk2."
"This lens is amazing. The quality wide open just stuns me everytime. Between MFD and about 5 feet, it is easy to manual focus. But something between 20 feet to infinity is pretty hard to focus through the view finder."
"The best lens I've ever used. It's optical performance is overwhelming - aberrations are extremely well corrected, extremely sharp across the frame at all apertures with no distortion whatsoever."
"Excellent contrast and color rendering. Sharpness is comparable to best Canon lenses like 135/2. Flare control is very good. This lens has moderate amount of chromatic aberration, which can be removed in some RAW converters, but some Zeiss ZE lenses have better correction."