Nice thread idea, OP!
I've also got the T4i (aka 650D) and the 920, so these shots interested me greatly. I'd never thought about doing a comparison of the pictures each takes.
One thing I'm noticing about the 920 pictures (even in comparison to the 620) is that it tends to over-saturate brownish colors (or maybe it just makes browns more...brown). Mine does the same thing, especially compared to my S3 and iPhone 5. I was worried there might be something wrong with my 920, but now I can see that's just how it is.
I will say this, the Portico update made a world of difference to the camera. Believe that or not (I know there are some people here that don't believe it), but it did. I bought my first 920 back in November, right after it was released, and the camera was SO bad compared to my S3 that I ended up returning it. I just got my new one last week and the camera is better in every aspect (or maybe I should say the camera software is better). Either way, it takes much better pictures than my first 920.