Shit, I buy a prime lens (and I really like them and there are dozens of them), you expect to trade the flexibility of the zoom for the sharpness and lack of aberrations this type of lens. This is not the case with this lens. I've tried everything to convince myself that I'm using it wrong and that it can't be that bad, but it is. Unfortunately, not only is it less sharp than all of my other primes (some of which are worth 1/3 its price). It's also less sharp than all my zooms. Also, it's very noisy. Loudest lens I've ever seen. In combination with the A900 you have mirror rattle and shutter rattle. Beware of using earplugs!
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