Just a heads up. Any imported SVG that are set to percentage width's in X & Y fields suffer from a x4 magnification. This is across the board. It effects other websites, however in most instances it appears that the problem simply slips by them without raising alarms.
I've found no answers resolving this problem. I'm simply left hoping Opera fix this implementation problem in their browser.
No its not a typical SVG browser implemenation problem, as this only effects Opera when used through a high resolution Retina display. Opera running on OSX on a non-retina display aren't affected.
Equally all other browsers running on a Retina display arent impacted by this glitch.