The passenger side is the curved one, but not in the way you might expect. Or at least it wasn't what I expected when I first saw one.
While looking for a photo of one, I found this Ebay listing by A8parts for a pair of genuine blades:
https://www.ebay.co.uk/itm/Audi-A8-D...-/132111764701
It's difficult to see what I mean from the angle of that photo but I'm not talking about the usual curvature of a wiper blade as it wraps around the windscreen. The blade is actually permanently bent, such that you would see the curvature if you looked at it from directly above (with the blade stood upright on the rubber).
Another disadvantage of the OE blades I found, was that the curvature meant that the passenger side blade couldn't be parked as low as the drivers side blade. The asymmetry of the OE blades bugged me too and, being higher and more visible, I thought they looked a bit ugly.
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Mark
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2002 FE S8 Ebony Black Pearl
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Cars Owned:
The Tesla Era: 2020 Model S Performance Ludicrous+ (present)
(Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability)
The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust