Well I actually think there are definitely very good Hidef screens and bad ones and this makes just as much difference as the souce.
I previously had a Samsung 26" BDX ( I was one of the first to contribute to the huge thread elsewhere) and I found this set to be amazing, in particular watching Staw Wars Ep 3 and also Sin City to name but two recent and enjoyable films.
Anyway that set was nikked while I was at work and insurance finally coughed up with the money - even though I had to go to a particular store on high street to replace it. I duley did this hoping to get a Samsung, even if I had to put in a little extra to get a 32" during sales etc, however they didnt have any and couldnt get hold of any.
Instead I chose a 26" LG, witha hi def 1366*768 panel and seemingly the same kind of performance. At best its ok for a bedroom tv, and using consoles but with the same dvd player on the films above and thedetail just isnt there, i dont know how else to say it - the crispness and clarity, its not as bad as on my standard 42" rear pro tv, but its no where near as good as the Sammy - yet the panels are very similar spec so it must be the cheaper electronics or such like