The 6700 XT's suggested price was very likely already inflated in the context of 2021's GPU scarcity, though, so it was overpriced from the get-go. But a QHD/4K benchmark between the two would have been interesting, though it'd be an apples-to-oranges comparison in some games if the 3070 isn't properly loading textures.
That being said, the whole 'Nvidia has worse image quality' thing has been going around since the Riva days, sometimes just as a conspiracy, sometimes confirmed by some driver or hardware limitation such as possibly here.