Sharpness. Images out of the RF 24-105mm f/4L IS show very good to excellent sharpness right from f/4, throughout the zoom range. Central image sharpness is excellent at all focal lengths and apertures, and even edge sharpness is quite good through most of the focal range, with a bit of softening at 24mm and 105mm.
There are far more reputable sources than Ken Rockwell. First things first - F4 L IS USM compared to F4-7.1 IS STM is constant aperture, meaning that in L at long end you have 105mm f/4 and in non-L you have 105 f/7.1. That's HUGE difference in therms of DOF, light comming in etc. Then there's different number of aperture blades (the L should
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canon ef 24 105mm f 4l is usm sample images
