So sharp it will make your eyes bleed. Seriously though, its sharp wide open -- if you can call f/5.6 wide open. Despite being only f/5.6, your back and shoulders will thank you because this lens is as light as a feather, figuratively speaking. I also have the 200-500, which in the right hands is also a very sharp lens. But, I can assure you that you will definitely notice the difference. It's quite an upgrade over the 200-500, though I do miss the zoom.
Pros: * sharp * lightweight
Cons: * can damage retina if you look at resultant photos too closely * expensive
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