Fort Santo Domingo and Old British Consulate

I took my 24-70mm lens and D700 to photograph this location.  I should have a tripod with me to get highest quality images possible.  I did not thus I had to tweak the prospective of each image in Photoshop a bit.  However, I was already lucky enough to have so few tourists in the photograph.  The whole exercise was more on waiting for the brief moment when suddenly all the tourists just walk off from the image frame.  I had to act quite quickly and tripod was not an option.

24-70mm is such a good lens, can you tell the image just seems a bit better than those taken with the consumer zoom lens, such as 28-300mm.