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I've never used a Zeiss lens, and the colours and contrast out of camera are everything I've heard and more. Simply breathtaking compared to other manual lenses I've used, and the Canon 50mm 1.8. In case anyone's interested in this lens, here's a few test images from Canon 5D - never done this before so tell me if there's anything wrong with the set-up .
All images are out-of-camera default RAW, converted to jpeg in Photoshop.
Overall I agree with the sharpness summary of this lens on this page.
Shot these just now, again all default RAW settings straight out of camera. At f2.8, sharpness corner to corner is excellent imo. Easy to focus on stock 5D screen, really nice DoF effect.
At f1.7, edges and corners are not so sharp, but this results in a pleasing smudged DoF effect. There's a degree of vignetting, but flare is really well controlled. The lens is very hard to focus well on the stock screen at 1.7, with the DoF being extremely shallow on the 5D.