Audioholic,
I don't think Andrew was being dismissive, I'd say honest. It's not just a case of the screen being 5 inches bigger. For example, on some TV's the LCD panels used could have been sourced from a different supplier for each size. Also although the technologies appear to be the same, for example the power supply circuits for the bigger screen could be completely different, which can make a big difference to the picture. As is often proven by reviews, models in the same range don't necessarily perform identically.
And it's not fair on anyone asking for advice about equipment, if that advice (especially by reviewers in a well respected magazine) isn't based on having used or tested the equipment concerned.
Rob