I've been happy enough with the 24-85Vr on my D800 and think it will be equally good on the D600. Interestingly enough Ken Rockwell also favours the 24-85VR.
The reviews I have read seem to suggest that there is no advantage to the 24-120VR other than the constant f4 and the slightly longer focal length.
I think that if I was to "upgrade" from the 24-85, it would be to the 24-70/2.8 but not the 24-120, however, this is a personal view and not a criticism of other's lens choices.
The reviews I have read seem to suggest that there is no advantage to the 24-120VR other than the constant f4 and the slightly longer focal length.
I think that if I was to "upgrade" from the 24-85, it would be to the 24-70/2.8 but not the 24-120, however, this is a personal view and not a criticism of other's lens choices.