athenaesword, non-scene groups/releasers are generally quality-conscious because they have other goals (or limitations) than scene groups.
The 720p scene rules state that standard length tv episodes (37-59 minutes) should be 1100mb in size and that doesn't cut it most of the time (the possible video bitrates of scene releases are as low as 3200kbps). Non-scene releases are typically 1500mb or 2200mb (1/3 or 1/2 dvd size) which allows ~4000kbps or ~ 6500kbps and a visible improvement in most cases.
Much of the same is true for movies because most scene released movies are made to fit on a single dvd (~4.4gb) as this is encouraged by the current scene release standards (dvd9 should be used only in cases of long movies, or high action movies). Another rule to favor the non-scene alternatives is the lack of quality control of scene releases because qualitative issues are no valid reason for a proper. What this means? Some group can hurry the process along and make a bad release of a movie and as long as there are no technical issues, this bad release is most likely the only scene release you'll ever get to see. Non-scene movies are usually a bit larger (by 1/3rd in most cases) but like with tv episodes it ensures a standard of quality that is higher than the casual viewer will ever want for.
To answer your question: yes I believe CtrlHD and ESiR are the two most competent p2p release groups and I've only had to re-download one movie in all my time at HDBits. I'm talking about the latest Bourne movie where CtrlHD (or was it ESiR?) fucked up the non-English/Russian subtitles which should have been hard-coded or included at least.
ammendmend #1: you don't need an account at HDBits necessarily. Try hd-bits.ro and search for those groups, I know of at least a couple of CtrlHD and ESiR movies over there and some of them are free leech. If you have some Usenet access try the same search too, you'll wonder how much stuff is available there

The latest I just downloaded is the complete bluray rip of the 3rd Lost season in 720p (~53GB in 23 episodes, minus par files).
ammendmend #2: GoldStoNe, I obviously didn't read your username careful enough or I might have noticed the difference myself

You're right about the hail to all hd-masters though, most of my current traffic is for highdef content!