Nate, I shoot weddings a lot here in Nebraska and I have an HDTV that I use at times to check how things look. I agree that when you talk to them that you ask the what their TV aspect ratio is set to and the same for their dvd player. I use an SD Progressive scan DVD player that plays movies in wide screen on my TV set. DVD Player is told that the TV is 16:9 and the TV knows that it is a 4:3 signal coming in through the composite connection. Plays SD 16:9 Movies in beautiful quality yet when I play SD Wedding footage that is, low and behold shot on GL2’s, it comes out looking OKAY, not great but OKAY. People need to start to realize that a SD picture when it is done is 640 by 480 and even a 720p set is 1280 by 720, you are scaling the picture up to fit that resolution. If I freelanced weddings instead of working through a franchise I would be shooting on like an HVX200 or EX1 and produce a widescreen product on an standard DVD. Picture comes out solid as a rock and looks much more beautifil.
Sorry for the long post but I hope this helps.