A client who purchased both icon sets asked, when iOS 7 icon pack would catch the Windows one. We create 3 flat icons of Windows 8 and 10 line icons for iOS 7 every working day except holidays and vacations. So I’ve built a simple graph, attached. As you can see, they would be even at around 120 days or 4 months from now.
The graph was built with this great tool. I find this tool looking scientific and cool. Here are the parameters I’ve used: