I took the "Pepsi Challenge" in the '70s. I had no trouble distinguishing which tasted best...and it was Coca-Cola (PRIOR to the switch to HFCS), hands down. They hustled me away from that kiosk and quick!
As a matter of fact, I earned a small measure of fame when I was working (briefly) at Mickey D's in 1979-80. I could tell, from taste alone, when the post-mix machine mix setting was off by five percent. The manager confirmed it with the cup tester and couldn't believe it!
(Now beer, OTOH...I wouldn't know the good stuff from the bad!)