iOS is stagnant or mobile OSs are stagnant?

Android was listing screen capture as a new feature not long ago which hardly suggests a breakneck pace of change across the board.

Windows phone tiles are interesting but they don't feel game changing.

Is this an iOS thing or wider than that? Genuine question because if it was iOS alone then surely it would be eating Android's dust right now and that doesn't feel like it's the case, it feels like they're pretty much on a par.

(Just say I'm not wild about the word stagnant given that this is a market that has gone from nought to sixty in about the same time as it takes MS to get a version of Windows out, but it does feel like that pace has somewhat plateaued in the last 12 months or so).