Sigma 60-600mm review by SonyAlphaBlog: “In good lighting conditions performances are excellent in term of sharpness”

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SonyAlphaBlog tested the new Sigma 60-600mm lens and concluded:

The Sigma 60-600mm F4.5.3 DG DN Sports (2369 euros) is a a monster zoom lens extending the classical 150-600mm to reach 60mm on the low end. This unique 10x range is very versatile and allow to use it for wildlife and sport to take group shoot as well as tiny detail of a player or a bird and to be able to follow a distant subject coming very close to you, which is the main issue with a 150-600mm where you are stuck when your subject is coming close.

In good lighting conditions performances are excellent in term of sharpness on the entire range with although a little drop a 600mm.
AF is also very good in standard situation but for fast moving subject , the lens loose track when subject was coming near or with erratic movements.

Although build quality and ergonomics are very good there is 2 points to take into account: Weight is huge and you can hold it more than 1 minute and be steady, so a monopod or a tripod is a must with this lens. I was also annoyed not to be able to zoom fast as zoom ring is quite stiff. I also had to take my big bag to transport it.