Although I got the 24-70, most of the time the 14-24 was attached to the D700. I like taking pics of Churches especially the interior - the architectural effect. Imagine the spectacular view of Church interior, from the floor to the ceiling, from left wall to the right, you cannot separate them, only 14-24 can do that. Sometimes there was no way you can step back, even when taking pics outside. The time when I use the 24-70 was taking pics of sculpture such as the Pieta by Michelangelo that I couldn't get close
http://www.pbase.com/wcyeung/image/125897258
In some instances there was no time to change lens, quite often no tables or chairs nearby to do the change (you don't want to drop any one of them) and I got to stick to the 14-24 e.g. the one of the Pope, surely it is better to use the 24-70 (it was taken at 24 of the 14-24 and crop iafterwards)
http://www.pbase.com/wcyeung/image/125116973
Fast lens is important such as this one of the Colosseum - ISO3200, 1/20s, f2.8, definitely needs the combination of D700 and a 2.8 or faster lens.
http://www.pbase.com/wcyeung/image/126175371
I will post some I took with the 24-70 in the next few days
I spent 4 days there but would like stay longer, lots of places to visit, good Italian food (except the weather was not good during my stay - another reason I didn't want to change lens when I was outside) Hope you enjoy the time there and take lots of pictures and share with us.
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William