Webfonts currently will be rendered differently in Chrome and Firefox, so especially under Windows Chrome has a really bad font anti aliasing. But sometimes thats not the point.
First make sure you have set the font-weight correctly. If this does not help, you might have the font installed locally? No? I´m sure, you have! You needed it for your screendesign 😉
Delete the font locally and reload your website (maybe you have to restart chrome), the font should be rendered fine now. Take care deleting the whole font.