I strongly recommend the reader to evaluate themselves, it is truly beneficial. What is considered to be good, better or best image appearance is of course in the eye of the beholder, even if there are some quality factors that can also be measured. In the below example, in my opinion, the quality difference is very apparent. Please evaluate under a dim or dark ambient lighting. Sharpening is better in the shadows.
Colors are the same as in the original.
More details are seen. So, there is a difference clearly. Image should not be altered at all by such a kernel but it changes. Only if the center box and the scale are set to value 8 or below the image image does not change. Now only kernels that have the divisor smaller than 9 operate properly, and there are only very few such usable kernels.