I think I just prefer the 3:2 most of the times, except maybe for vertical shots. I keep shooting 4:3 to get the extra resolution and because raw file will give me that format anyway. But often I find that cropping to 3:2 just works better. For wide panoramas even 16:9. Some times the pictures is not framed right for 3:2 so I just can't. I tried to get used to the 4:3 format but I'm still not convinced. Yes, I could change format for any single picture, but in practice I'm not doing it, so I'm trying to find the one format to use by default. What do you think?