Well, I watched my £3.49 R3 DVD of A Knight's Tale and the quality was excellent. I imagine it's just the same master as the R1 version. All the extras are included too. There are optional English subtitles, but they're hilarious, with a spelling mistake in almost every line
But there is nothing to indicate that it's a R3 DVD as everything is in English, even the menus and boxart. The picture and sound quality is just as you would expect on R1 (since it's NTSC).
Kill Bill R3 has brilliant quality picture and audio as well, but obviously the lack of english subtitles is a bit of a problem
I think I'm going to buy more R3 DVDs because they're a lot cheaper and seem to be just the same quality
