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Not seeing this on AT&T so it must be a CDMA thing.
Same here. I had an AT&T iPhone 5, and actually noticed better battery life when I updated to iOS7. I now have the 5s, and it's wonderful! Battery drain is quite slow.
I'm starting to think iOS7 works best with the iPhone 5s, since both the OS and the phone are 64-bit, and it would seem logical to me that iOS7 was written FOR the 5s.
I've only had the 5s for 2 days, but it's looking like my battery only drains down to 75-80% by bedtime (from a full 100% at 7:00am) - typical day's usage for me is checking and responding to e-mail and text messages several times a day, placing 2 or 3 short phone calls, using the Kindle app during lunch (approx. 40 minutes' reading time), and surfing the web/Facebooking/reading news sites for approx. 2 hours.
I've also noticed iOS7 on the 5s has far better memory management than the 5. I have a memory cleaner app ("SYS-Activity"), which typically reports 200MB or so (sometimes less) as free memory, yet the phone never slows down when I open more apps, and I can switch between apps with no apparent problems. The app will only free up to about 375MB or so of memory on the 5s, but would free up to 600MB on the 5 - this tells me iOS7 is a memory hog, but has much better memory management than iOS6.