Addendum:
Some, but not all, of the Blu-rays ranked in the various tiers look as good as they possibly can on Blu-ray given limitations in the original photography and the director's intended visuals. We recognize films and videos are not all created with the same intent and quality, and this is why certain titles can never achieve a tier zero or tier one ranking for example, even given a perfect transfer from the best possible source. Rankings as low as tier four can still constitute a worthy Blu-ray release, as long as the Blu-ray is visually transparent to the best available source for a particular title.