I did the same sort of testing, but with printed (HP-Z3200) 2ft x 4 ft test patterns using the Electronic Still Camera Picture Test Chart (
ISO 12233 Test Chart). I found that the 55-100 zoom is so good that I can sell my 55mm, 75mm, 90mm and the 105mm and not look back.
I can't upload all the images (there are several hundred), but I will upload the 55mm f4 (SMC Pentax 67 late version) and the 55-100 zoom cropped images. Both are at f8, and you can see that there is little to choose between them. A full sized chart is included for reference crop size reference.
The top image is the 55mm f4, the middle image is the 55-100 zoom at 55mm.
I repeated this for the 75mm f4.5, 90mm f.2.8, 105mm f2.8, 135mm f4,165mm f4 and 200m f4 and the results are the same: the two zooms are the equal or better of the any of the primes in terms of sharpness and detaill (no 75mm f2.8 AL, sorry) at their respecitve best apertures. With the 645D, the best apertures were f8-f16.
I could not compare the 300EDIF directly because of the difference in focal lengths compared to the zooms.
materialsguy