_,,,^..^,,,_ said:
The lossless capture of the video will be around 15/20TB, not so pratical to have a copy of that! (^^,)
I think a good encoded BD-50 will suffice because, as poita said before, the overall resolution will be lower than the 4K UK or the Mondo BD, as they are mastered from the negative, then good enough to retain all the print details.
A BD-50 graded to match the IB would be incredible!