I am a cognitive psychologist and have done a great deal of research on consumers’ perceptions of products using a method based on simple similarity judgements between pairs of products. So, while it is fairly straightforward to determine whether two videos seem the same or not, the tricky bit is to know why any perceived differences seem different. Actual differences might be masked in a low-quality medium such as YouTube. However, determining whether a perceived difference is due to the product or the display technology is the tricky bit. In such cases you might want to run down to your local dealer and check it out for real.