Translation of "Vastly" in Japanese

I think this suit is vastly superior to that one in quality.

この服は品質においてあの服よりも優れていると思う。

Yet it is massive and has vastly improved the lives of its citizens.

でもそれは大規模で 市民生活を大幅に改善してもいるのです

- There is a vast difference between being able to make oneself understood in English and mastering the English language perfectly.
- Being able to make oneself understood in English is vastly different from mastering the language perfectly.

「通じる英語が話せる」のと「英語が完璧にできる」のとは全く別のことです。