Well, both of my Sony Bravias have been perfect in this respect. My dad's LG isn't all that reliable when it comes to changing aspect ratios though.^ Which one?
Not certain yet. Probably something from Panasonic simply because I've found them to be the most reliable when it comes to automatically making aspect ratio changes. This is for the living room and if I don't get one that does that properly then I will be seeing a lot of stretchy vision because nobody else will bother doing it manually.