Birding lens advice

KennyWKennyW Registered Users Posts: 8 Beginner grinner
edited January 17, 2011 in Accessories
Currently I am using a Sigma 500 f4.5 and would like to upgrade to either a used Nikkor AF-S 500mm f4 ED II, or a brand new Sigma 800mm f5.6.

I can't decide on which to buy yet. Can anyone give me some advice on which is better in terms of image quality and so forth. I shoot both still birds and BIF.
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