I have only heard Envy's voice in the English and Japanese.
English: I actually don't hate his voice as much as most people. It doesn't annoy me or grit on my nerves, it's just strange. I haven't seen the episodes when he loses his temper yet, but it's hard to imagine him screaming, yelling and showing immense emotion.
Japanese: Perfect, perfect, perfect. While it has feminine tone in it, it's still masculine enough to pass for a male. His voice actress does a superb job. Have any of you seen "Fullmetal Reflections" when Envy is contemplating the series with Greed? At the end I got goosebumps all over my body from Envy's intense yelling. I almost cried. Those emotions of fear and loneliness don't even suit Envy yet it was still spectacular. I totally forgot at the moment that he was not a real person; that's how amazing his voice actress is.
Thank you, Ms. Arakawa, for sharing this wonderful, enriching story that has affected so many of us!