We do. But they look completely different to each other. iPhone sees Droid emoji as iPhone emoji. Droid sees iPhone emoji as Droid emoji. So, you'd never know. Except Droid wall art and stuff looks wrong all the time
Ummmm...no. Apple is using Apple emoji. Google is using Google emoji. Adding support for both is solely ATA's decision.
Yeah i've used a cpl android's and had varying emoji types displayed, depends on ur device's abilities i think.
Yea when i change my phone the look of emojis changes. But you can get keyboard apps that give pretty much the same emojis and iPhone.