The A8 probably has a 20 times advantage on this computer's chip in single core speed (the most important one), not even speaking about the GPU. The NFC with at that time had use cases (and barely more now). It had a 8MP camera that was much much worse than this the Iphone (if you think MP is a gauge of quality, then I can't help you). I got a G16 Canon standalone camera at only 12MP and it obliterated every cellphone's camera by a mile).
Well, I don't know how I would need 20x the performance of my GNote. Ok, it would be welcome, but it wouldn't be a sufficient point for upgrading. I'm running the current 4.4.4 Android version with a custom firmware. I have more functionality today with this phone than I had in 2011. There are tons of barometer and NFC-payment apps. Maybe Apple will push the "smart wallet" market and our old NFC-capable devices will do the payment stuff as well as a brand new iPhone.
About the camera point: I doubt the 8MP iPhone 6 camera will beat the GNote camera by a large margin. The short answer is: the new sensors will be about as small as the ones found in older iPhone models. I'm waiting for GSMArena and DPReview Connect reviews. I bet I'll see the original GNote matching iPhone 6 Plus on studio tests.
I know, you'll argue about real life pictures, phase detection autofocus, OIS and the dual-tinted flash. This will make some difference, but anyway it's fun a 2011 phone camera being able to match the iPhone 6 camera quality in a lot, if not most, daily uses.
It's even funnier when my father is doing great pictures with an even older Nokia N8 (12MP, 1/1.8" sensor, Carl Zeiss optics, really low CA for the class). I bet this Nokia phone will beat the new high-end iPhone in still pictures no matter what condition. Its high ISO performance compensates the lack of an OIS. Correct me if the new iPhone has a sensor as big as this 2010 Nokia smartphone.
Regarding your G16, I wouldn't be surprised if a Nokia 808 Pureview (1/1.2" sensor, 38MP, f/2.4 max aperture) gave better results than your compact camera in various daily situations. Ok, it lacks a digital zoom, manual controls and so on, but it would do a great job in daylight situations. Your standalone camera will certainly beat a Lumia 1020 in most situations, though.
Lastly, I doubt the new iPhone camera will be a major upgrade. Microsoft, Sony and Samsung will stay in a comfortable position in respect to their phone cameras for one more year.