There is always a short coming for browsers in windows phone ecosystem. Till now the only popular browsers for windows phone which I noticed were Internet Explorer 11 ( comes built in with the phone) and UC Browser( This browser is popular in windows phone).
Opera Mini is a well known browser and very popular on feature phones and android devices. Opera also has their own high end browser called Coast, designed for iPad. So what is making news? Opera mini is available as beta for windows phone now. You can register yourself at http://opera.com/wpbeta to try out this beta version.