Nargott
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Perhaps the dragons' weight should be increased from 500-600 kg to 800-1000 kg (visually, they are clearly heavier than those figures), but as I mentioned before, 12-meter wingspans wouldn't be able to lift that much weight. Either we need to make a plausible assumption that dragons are significantly lighter than they appear, or we need to attribute half of the weight to "pure magic" (hidden, unexplained reasons).
In general, dragons of roughly similar size appeared in Game of Thrones (Season 6). But in Season 7, they promised dragons the size of a Boeing (about 70x60 meters), and I was disappointed by such fantasticality (as well as how such giants grew to such sizes in just a few years and why these creatures haven't wiped out all life yet).