I can only go on N9 vs N8, cos i've never managed to get my hands on an 808, but they use the same Belle.

N8 was an amazing camera hands down.

N9 is a pleasure to use, to type on, to be social on, hands down.

I've reloaded my old N8 with stuff for my brother, i'm going to post it to him in a few days, once i put together a DVD full of stuff for him, etc.

I could not go back to the N8 from the N9. Even if photos are noisy in low light.

Take that however you will.