Tend to disagree about the effect of finish on the sound. Why? I had 2 identical Ibanez PJ Bass Guitars and the 2nd one was bought at a Pawn Shop and was looking a bit worse for wear. These days it would be called reliced but being a young early 20 something too obsessed with how it looked decided to get it spray painted by a panel beater. Sadly whilst it looked nice, smooth & shiny the refinish made it sound too bright and took away the warmth it had before. From this experience it taught me that aged instruments do sound better and some finishes detract from the natural tones.
However as Dedman said, once the signal goes through lots of processing into a room full of punters who do not give a toss what it should sound like things such as tonewood tend to pale into insignificance. However for those amongst us who sparingly use gadgets to shape our sound the difference can be quite obvious, but only if there are 2 identically configured instruments to compare with. Playing an electric unplugged is also a good way to discover the true effect the timber & finish might contribute to the sound.