The lens structure is different and the material is different. The so-called good or bad is man-made, and vanity accounts for more than half. If you say a few first-time films, don't you think they have no sense of space? All of them have a vague feeling behind their flat faces. Structurally, 100 mm fixed focus is better than zoom. The old 100 micron imaging is very good, and the new one has never been used. 70-200/f2.8 full aperture decal, What's there to pursue, .....................................................................................................................................................? Don't mix it into the 24-70+70-200 scam created by those wedding swindlers. Zeiss/Frieda/Leica/Pentax have so many good heads, don't be trapped in the fuzzy world of Canon for an autofocus.