The irony is that a significant proportion of the sugar in "old" Coke in the US was not actually cane sugar, but from sugar beets. But the obsession over types of sugar is largely ephemeral. All sugars are highly processed and refined and equally bad. HFCS's only crime is it's cheapness and ubiquity. Funnily enough, for interesting chemistry reasons, it doesn't matter which type of sugar you put in, it all breaks dow…
I can assure you, it tastes different... or at least Mexican Cokes in glass bottles do. Go find you one and drink it. It's substantially different and better. It's sooooo good.
According to the WSJ this is because "Food scientists have noted subtle differences between the sweeteners: High-fructose corn syrup’s sweetness intensity tends to peak earlier, enhancing fruit and spice flavors, while sugar’s profile is broader and lingers."