I think it's a little too early to declare a winner, but based on my experiences with the iPad 3 and the Nexus 10, I think it's very clear that Apple is at the very least starting to lag behind.
Granted, that's just a revolutionary iOS upgrade away from no longer being true, but even then I suspect the general design philosophy behind iOS could possible keep Apple from dominating the mobile field the same way they used to.
This is obviously only my opinion based on my own experiences as a user. I make no claims of having analysed the market and other user's behaviours or wants.
