Great thread. Nice to see the 928 being compared to some of the other popular smartphone cameras directly, instead of by proxy by way of the 920. I get that the 928 has the same camera module as the 920, but it would have at least been nice to see some low light comparisons to see how it fares to other cameras with it's xenon flash. Maybe it's a good thing, considering the white balance issues it has when it's on auto, which might have turned off some buyers.
To my eyes, the pictures from S4 are sharper than those from the 928, it's particularly noticeable in the third (tree in the middle with the red car behind it) and fourth (bush in the middle with the blu e-cigs advertisement to the right) set. Now given that the S4 is praised as being one of the best smartphone cameras (discounting the 808 and 1020, since they're in a league of their own) I think the 928 held up rather nicely. There is definitely some softness, but not unbearably so.
As far as the colors being over saturated goes, I think that's just a trade-off of the low-light capabilities. Not really sure how all of it works, but I'm sure being able to capture all that light in near darkness, affects how it take images in general including shots with good lighting. So we get a good all around camera, instead of a great one that we can only use half the time, I'd say that's a fair trade-off.