anyone with experience of the nikkor 17-35/2.8 on a d700/d3 that would like to share? is it a sufficiently better performer than the nikkor 20-35/2.8 for me to open my wallet? anything in particular that i should look out for in a used copy of this lens? what's a decent price?

i'm in gear mode. and in photo mode. a rare co-occurrence in my world.

thanks