I’ve studied both and let me tell you, I’ve come across people here who are completely amazed that they’re different. Back when I was in middle school I met a guy who was amazed that Japanese and Chinese people couldn’t understand each other’s languages, and in high school when I demonstrated the differences in sound to a few of my peers they were astounded to discover how incredibly different they sounded.
For the record: Japanese has a more fluent rhythm and a phonology that makes it sound like a mix between Spanish, Italian, and Finnish, more or less. Chinese is more sing-songy with heavier syllables. Also, syntax-wise they are very different, with Japanese using subject-object-verb and Chinese using subject-verb-object (with some odd caveats).
oh that's really stupid. I know absolutely nothing in either of those languages but would never say that they are similar, they're from completely different lang families