I can say the 600vr is a fantastic lens but worth the upgrade from the older 600, I really don't know. It has a closer minimum focus distance if that is important to you and of course the VR is a big help as well. I got the D3 and needed more reach so I had ordered the 600vr and will be selling my 500 after it gets back from cleaning and servicing at Nikon. I can say the image quality looks about the same I guess.....I really just wanted the extra reach and VR.