Actually, the PNG only cut the size down to 65Mb, so I figured the TIFF was as good as anything since it kept the steps to a minimum.
I tried the scanner, but it was an utter failure. The PW light overlay appears to scatter the light, so it came out looking far worse than it actually is.
You're right about comparing with the exact same image, but I'm trying to get at the somewhat subjective experience of looking at the same book within the limitations of the device. That you (and many others) still prefer the left display makes me think more and more that I'm either being overly picky or (perhaps more likely) I'm just used to the K3 and I'm interpreting the difference in the PW as somehow deficient. I'm going to stick to the PW for a week and then come back to the K# and see if I've changed my mind.