I currently use a Nikkor MF 500 f/4P as my big glass. This lens is very sharp and works great for static long shots. However, without AF, it's a real crap shoot whether I'll get focus on anything moving. I'm currently looking at the big Sigma lens which is about half the cost of the nikkor 500 f/4 VRII.

Anyone had any shooting experience with this lens? Any feedback would be appreciated.

Geo