Most likely. Don't worry too much about this though. It's something you can't change, for now. I, too, am using a kit lens for now and can't get the awesome pictures I want.
However, it might be something else that I learned about. Did you use any of the anti-shake or image stabilizers on the camera/lens? If you have the camera 100% shake-free (tripod and trigger), and still keep the anti-shake features on, the camera will actually vibrate slightly to counterbalance the shaking. Since there's no initial shake, though, you're left with a not-so-sharp image.
"Always temporarily switch off any anti-shake or image stabilisation systems when using a tripod. If the camera is perfectly steady these systems can actually introduce wobbling as they attempt to counteract something which isnt there."
This is the article I learned this from. It also includes more techniques for taking night shots.