The blog GooBing Detroit on Tumblr is posting side-by-side comparisons of the same locations from the two search sites' street views showing the changes between Google's pictures from 2009 and Bing's from 2012. WXYZ shows some of them in Street view maps show Detroit's past.
That was five days ago. Since then, MLive has picked up the story in Detroit's encroaching blight as seen through Google and Bing maps. That's a more pessimistic take than WXYZ's, as the TV station at least found some signs of improvement when they did their own comparisons.