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Well, the original Distagon 2.8/21 used glass which is not RoHS-compliant (probably lead-based), so the extra element isn't for extra corrections. The entire lens has been redesigned, with new glass. The CZ21 is and will be unique, and one like it can't be made again.
That being said, even if they only match, say, 95% of the original's optical qualities, that's still enough to blow away the competition, as it were.
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