I'd say even before the Oscar Berry was a bigger name than either Hatcher or Yeoh. Hatcher was a TV actress, yeah it was a popular show but being a big name on TV doesn't make you a big name in films. As for Yeoh TND was before Crouching Tiger and whilst I'd seen her (I think) before Bond I suspect she was something of a mystery to most people in the West.
Compare that to Berry who'd been in Swordfish and X-Men prior to Bond, and in fact had been around for years (I always forget she was in the Flitstones). She had added notariety from the whole Swordfish/topless angle, and, though I'm not sure, had she already been FHM's sexiest woman by now?
I wouldn't disagree that she became truly A list until the Oscar, but I still think she was a much bigger name than either Yeoh or Hatcher, or any Bond girl before or since, though it pains me to say it.