One can only but wonder what the quality of a new series will be, when sub-licensed from a copyright holder. In this case, the great Billy Wilder's 1957 Witness for the Prosecution, via MGM to Kino, the quality is quite good.
From what I'm able to see, any problems arise from built-in dupes, but even in dupes, aside from a slight loss of resolution and minor mottling, the image harvest holds up very nicely.
From blackest blacks to whitest whites, the gray scale yields a high quality image. Likewise, audio, in DTS-HD MA 48k represents the film nicely.
A great film, from a superb filmmaker and an absolute A-list cast. Tyrone Power, Marlene Dietrich, Charles Laughton, Elsa Lanchester and John Williams. The film was nominated for six Academy Awards inclusive of Best Picture.
Bottom line. Forgive this Blu-ray the look of the dupes, as this is the way that the film has always appeared. They are properly brought to Blu-ray. Focus on the beautifully represented original material, and enjoy.
Image - 4.5
Audio - 5