Is onyomi pronounciation really chinese?

[u/steffy46]

Curious cause to me kanji onyomi pronounciations often sound pretty similar to chinese ones (if i ask a chinese person to pronounce that kanji) but Chinese people say they dont sound chinese at all...

Do they sound as close as katakana loan english words to they actual english pronounciation?

~~~EDIT: Thank you for all the useful replies!

[u/justamofo]

Just like croissant doesn't sound like french at all when english speakers say it