Here are more scans of XTOL and concentrate. These were saved at a higher JPEG-quality than my prior scans, so everything should be slightly crisper, hopefully making comparison easier. In these, I manually focussed the scanner on the rear window of the car.
Frame 15: XTOL: hp5-xtol-crop15.jpg Concen: hp5-conc-crop15.jpg
Frame 16: XTOL: hp5-xtol-crop16.jpg Concen: hp5-conc-crop16.jpg
Frame 17: XTOL: hp5-xtol-crop17.jpg Concen: hp5-conc-crop17.jpg
Can you see any consistent difference between the pairs?