Not to be "anti-fit" but I agree with Black Wallnut, soreness isn't only a sign of bad fit, it's a sign that your body is getting used to cycling. When I started on a road bike, I had trouble with neck, shoulders and the like. Those issues went away as I rode more, but my bike's fit has not changed. That's not to say that a fit might not have fix it quicker, but I'm fine now and still have that $250 in my bank account.
I guess what I'm saying is, if issues *persist*, look into getting properly fitted.