I can tell you that when Pepsi did their "Throwback" soda this past spring (it was Pepsi with REAL sugar, not High Fructose Corn Syrup) my kids LOVED it! They have never said a word about soda brands, coke vs pepsi, etc. before this. All of them kept saying how much better the soda tasted and asked if we could get this soda all the time. They were really dissapointed when I could no longer get it.
In Ireland, my brother and sister in law who drink regular Coke, kept commenting that the soda was so much better there than in the US when we went a few years ago. I thought they were crazy, but I only drink diet coke, so I didn't taste a difference. After we were back I read that both COke and Pepsi make soda with no High Fructose Corn Syrup for Europe and other countries that don't allow the HFCS in their countries. I had wondered if that's why my family loved the Coke so much in Ireland.
When my kids raved about the Pesi Throwback, I became convinced that HFCS tastes like chemicals compared to real sugar. It's a shame you can't buy it all the time.