C,mon guys! What's the point of posting if you DON'T have the problem.
This wifi problem is well reported on this and other forums including the apple forum. My personal experience is:
1. Wifi working perfectly with ios4
2. update to iOS 6
3. Wifi sensitivity very low and wont see the SSID unless very close to the AP.
4. Subsequent iOS 6.xx version updates have not fixed it.
The question remains :
Does iOS7 fix the wifi issue caused by ios6.?
Please if you don't have a problem and/or answer, what's the point of posting?
I'm personally not updating unless the issue is fixed!
Waiting until the Ubuntu Edge is released.