I dont understand all the comments about having to boost the rear surrounds and reduce the fronts for this 5.1 mix.
I find this recording very satisfying without making any changes at all. Just for the record, I use a SPL meter to insure that all speakers in my 5.1 set up put out an equal amount of sound energy. I wonder how many others do this? (along with having surround speakers that arent a cheap afterthought)
I think it has something to do with expectations. Sgt Pepper is a 50 year old piece of "art". It was recorded with a mono presentation as the objective, but they (Beatles and Martin) thought way outside the box in terms of the production elements. Ultimately, a mono presentation did not do justice to their artistic vision, but they did get as close as they possibly could.
That being said, a Steve Wilson or Elliot Scheiner 5.1 type mix would not have been appropriate for this iconic recording. I think there would have been a huge outrage for mixes that went crazy with tons of discrete music elements. That is not within the vision the Beatles had.
What I LOVE about the stereo remix and the 5.1 is the increased presence and clarity of being able to hear the individual instruments/voices, aided by having a more modern stereo soundstage. In this way, Giles and team simply broke through the limitations of the mono mix technology and let the vision become more fully realized.