You must be kidding if you think iOS 7 is just aesthetic changes. So Apple iOS engineers took one year leave and left their designer colleges update iOS 6 to new look?
UI
Inter-app audio
Background fetch
P2P (arguably, this isn't a new feature, it's essentially a wrapper to dns_sd)
Airdrop
Significant KitKat changes: *Actual* SMS/MMS API
Storage access framework
Printing framework
Plus, Inter-app audio and Airdrop are essentially wrappers to P2P (which is also a wrapper to dns_sd), so the only real added feature was background fetch.You could say the same about KitKat (except for SMS), so really it boils down to this:
iOS 7:
UI
Background fetch
KitKat: SMS/MSS API
Which Android still wins, IMO.Plus, Android already has way more features than iOS already, not to mention the ability to install unsigned software, NFC, custom lockscreens/launchers and who knows what else.
It can win just for your hobby or taste, but not for end users. And end-users define the business. Not your taste.