With those little bitty scaled-down snaps, there ought to be no discernible corner softness with a big 2.8 pro zoom (and IMHO there isn't); we're mostly eyeball

With those little bitty scaled-down snaps, there ought to be no discernible corner softness with a big 2.8 pro zoom (and IMHO there isn't); we're mostly eyeballing center sharpness, white balance, and range of contrast. Of course there'd be less barrel distortion with a prime... but it doesn't stand out either way with these scenes. You can see there's a little less blowout on the shiny roof with the 5D, and quite a bit more detail in the shadowed city streets. Certainly a higher color temperature, probably more accurate. But the 4S is quite impressive nevertheless. No apparent vignette issues. These photos are not useful for assessing high ISO noise/grain...