Bet you didn't know that! You may or may not know that there are five different tastes - sweet, sour, salty, bitter and the recently described 'umami' (Japanese for 'delicious) - and that different areas of our tongue have the specific taste receptors, more commonly called taste buds, to detect each of these tastes. But cats completely lack sweet taste receptors!
It is believed that about 40 million years ago, which seems like a really long time but, evolutionarily speaking, isn't that long, the genes coding for sweet taste buds were lost from the feline genome - so this applies to lions, cheetahs, panthers... right down to our domestic cats.
This may also explain why they tend to be such fussy eaters!

On a related note, did you know the panthers and jaguars are the same animal, but panthers have a genetic mutation causing them to black all over rather than patterned - similar to an albino animal, only black!