It all depends on the movie and transfer they give it, for example Vera Cruz, a movie western from 1954, has a bitrate that often hovers between 36/37mbp/s, it needs to as that film is grainy and the encoder can't handle it without a higher bitrate, its ugly looking due to issues with no anti halation backing and poor lab processing but its true to the source.
I like my movies to look like film, that includes preserving film grain as that is what makes up the detail you are seeing and on a projection system the preservation of the film grain makes it look so much like being at the cinema.
Blu ray uses variable bitrates though and some transfers will have peaks in their mid forties while a longer film uses more disc space ( lets say a 4 hour film ) and it may peak at high twenties, how good it looks depends on the skill of the encoder.
VC-1 codec at low bitrate tends to smooth the image, i'm talking 16mbp/s or under, i dislike that and you can find many examples of this smoothing on earlier Warner titles, films like Batman Begins. VC-1 at reasonable bitrates is as good as AVC though.
I sometimes take bitrate readings for my site, heres an example from the classic spy film, Charade.
http://www.darkrealmfox.com/film_reviews/wp-content/...
Note the average bitrate readings.
I should add bitrate is not usually why something can look bad on blu ray, by that i mean its the old adage garbage in and garbage out, the studio could use a very old outdated DVD master, something which has baked in issues and they could encode it at an average bitrate of 35mbp/s and it will still look rubbish, on the other hand a new film shot last year could have a bitrate of 25mbp/s and look just great, so much more to this than just bitrate.
Anyways i'm going on and on now so will stop, i'll just say for me its all about preserving the way the film was shot without them adding artifical "enhancements" which can destroy the look of the movie.
Edited by deleted (Thu 03-Nov-11 20:13:13)