obviously the performance of the camera is the same but the outcome of the image is very different.
a long focal length lens means that you can shoot further distances and things further away.
the object is magnified so has the same effect as moving closer to the object, this would normally be fine but if something is too high or somewhere where you cannot get to then obviously a regular focal length lens is not suitable.
the picture quality should not be effected by lens if the lens is good enough.
For me using a Pentax ME Super with the long focal length lens and the regular focal length lens which both came with the camera and brought at the same time the quality should not change.