Np.
I think what I will say is that blind testing versus A-B testing everything seems to be much less pronounced. I've said this before, but I've listened to the K13 and K15 enough to be able to describe the differences in sound. But that goes out of the window in blind testing. It's probably an exercise worth doing for anyone interested.
I did have to move the K7 to be in the same spot as the K15/13, but I suspect it would have been better to have moved everything into another room so as to have better test conditions.