Slow, heavy, lame and wobbly (google aberrations "chromatism" and "coma") is a piece of expensive optical glasses;) A bunch of aberrations spoils the resolution; if in the center of the frame the picture is not bad even at f / 1.2, then there will be a continuous "soap" on the edge (aberrations: coma, position chromatism, astigmatism, field curvature) However, its value lies in its incorrectness! This lens draws a distorted, but sooooo beautiful picture! So beautiful that I got rid of 50/1.2L, 70-200/2.8L IS, 70-200/2.8L IS2. He left only Zeiss APO-Sonnar 2/135 - but only because the "hare" has its own narrow niche of "technical" shooting (Zeiss is many times sharper, but also many times more boring)