Translation:Is southern food sweeter than northern food?
Some Chinese regional foods are indeed sweeter than others. One such dish is sweet and sour soup.
Not quite. First, the word order is wrong. The correct order would be "Is Southern cuisine sweet compared to Northern cuisine?" 'Sweeter' is not be used in conjunction with "compared to." If you are intent upon using the comparative word "sweeter," then it's better just to say "is Southern cuisine sweeter than Northern cuisine?"
Also, most people don't use the word 'cuisine' in everyday speech, unless they're in the food industry. It's not incorrect, but it is more common just to say "food." (Native speaker, American English)