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What ISO rating were you both using as that may account for the different shutter speed values? It's odd that your images should not be sharp, considering you were working from a tripod and with remote release. Some lenses have to have the IS turned off when set on a tripod: see your lens manual for info on this. Even so, 1/60th of a second should be fine with a tripod in use. The only thing I can think of is that your point of focus was outside of your desired composition. From a tripod and at other times, I always use centre focussing and have never had problems with sharpness myself. Tripods are not always the best idea for every situation and providing you follow the old 1 over the focal length of your lens rule, you should be able to hand hold your camera comfortably with a good technique. Were you relying on autofocus without checking your image through the viewfinder perhaps?
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