[davidmanze]

So according to Klaus it looks like this zoom at it's best "easily exceeds the potential of the 36MP sensor"

And so it looks on the charts.

 

But according to DXO it provides, at it's best, 16 PMP - perceptual megapixels, their own made up measure. Which they take to be very good for a lens like this.

 

Now maybe 16PMP is the most you can hope for on a 36 real mp sensor: except that the Zony 55 1.8 peaks at what looks like a massively higher 28 (I think) PMP.  So it seems like there's a lot more potential on the 36MP sensor.

 

So what's going on? I'm confused....

 DXOmark seem to have established themselves as the "benchmark" for camera and lens ratings, personally I don't see their logic is sufficiently complete, especially when it comes to sensor ratings, they attach too much  importance to colour depth rating which to me seems one of the least important ratings out there. Dynamic range is an obviously important parameter as is ISO noise, but absolutely "no" account is taken for image resolution so their overall score seems strangely weighted.

   The Pentax K5 gets a higher overall score than the K3 because a slight drop in DR and a tiny drop in image noise, but looking at images the K3 outshines easily the K5 in terms of IQ. 

 Many people have scratched their heads trying to make sense of DXO scores and I'm one of them.