Android vs iOS Game Sales Comparison
games.greggman.com
games.greggman.com
To be sure, conversion rate isn't the best way to measure Myth #3. The correct measurement would be revenue per user (in app purchases, etc.).
So for example if a dev has both a free app and a paid "pro" version on Android, most will get the free one and make him money on ads (which isn't counted in these charts), while on iOS he will only release one paid version, so then it turns out on iOS he makes "more" from the paid version, than on Android - for the paid version. But I don't think I've seen a report yet that combines the total revenue per user or per app.