I have to ask, have you ever used the Nokia Software Recovery Tool to install new firmware? I don't have any of the issues you have on your L920. I think my pictures are pretty good. I know there's whole threads on the L920 area with people complaining. I don't have Cyan yet so I can't say much but I plan to use the Nokia software at that point anyway as I have DP.
Saying that, the 1020 shoots RAW. I'm not sure how you plan to use your camera but if you want the best quality that would be the way to go. Also, I believe in post production of photos so people always complaining about their shots is in my eyes people who want too much out of a camera. Even people with DSLRs 'fix' their shots.