Sigma 18-35mm vs Pentax 20-40
Hey all,
I'm considering picking up a Sigma 18-35mm f/1.8 Art. It's a darn fine lens. I'm just worried about the AF performance really killing it for me. So, the other option would be the newly discounted 20-40. It's not as fast, and isn't as sharp or as wide but it's sealed, small, and it's guaranteed to focus more reliably.
Thoughts? My local camera shop actually has a K-mount 18-35mm and I've played with it. I could always just buy it, shoot with it, and return it if it's not up to scratch. I like Sigma and I like that their lenses are still all made in Japan. It's a company with integrity and I'd like to trust that they'll solve the AF issues eventually with an update.
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