I bought this amazing camera a few months ago and have already taken it on a long trip to Iceland. I've finally complete my review, along with quite a few full resolution samples slices from whole frames, so you can get a clear idea of how these lenses perform on the 51MP sensor:
http://thephotofundamentalist.com/?p=2176 Hopefully it will help those considering such a purchase!
I really struggled to find samples from the 28-45mm DA lens on this camera and so have produced quite a large selection of crops and full resolution slices from edge to edge to give an idea of how well it performs (the answer being astonishingly well).