YOU SAID:
My pet fish is far prettier than your little sister.
INTO JAPANESE
私のペットの魚はあなたの妹よりずっとかわいいです。
BACK INTO ENGLISH
My pet fish is much prettier than your sister.
INTO JAPANESE
私のペットの魚はあなたの妹よりもはるかにきれいです。
BACK INTO ENGLISH
My pet fish is much more beautiful than your sister.
INTO JAPANESE
私のペットの魚はあなたの妹よりずっと美しいです。
BACK INTO ENGLISH
My pet fish are much more beautiful than your sister.
INTO JAPANESE
私のペットの魚はあなたの妹よりずっと美しいです。
BACK INTO ENGLISH
My pet fish are much more beautiful than your sister.
That didn't even make that much sense in English.