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https://www.sonyalpharumors.com/sigm...ked-costs-949/

22 elements in 16 groups (including 1 FLD lens and 4 SLD lenses),
minimum shooting distance 112 cm (wide-angle end)/160 cm (telephoto end),
maximum shooting magnification 1:4.1 (at 400 mm),
filter diameter 67 mm,
size φ86×197. 2mm,
1135g,
AF compatible with 1.4x and 2x Sigma Teleconverter (L-mount version),
compatible with optional tripod mount.
Price $949

Das EF-Mount 100-400 hat 21 Linsen in 15 Gruppen, das spräche für eine Neukonstruktion.