the last six years i was only shooting with single focal length lenses. except for the 70-200mm 2.8.
im gonna make the change to zoom lenses pretty soon and try to bring only those three lenses for a shooting.
the quality of those zoom lenses until 70mm is incredibly good i would say almost better then certain single focal length lenses.
but the best thing is: you dont have to make any compromise when it comes down to framing your photo, looking forward...