I needed a 60D lens for travel. I read reviews for several days and chose between 17-55 and 24-105L. The reviews advise more to take 17-55. But, of course, I subconsciously wanted L. As a result, I went to Gorbushka and there I didn’t have to persuade me for a long time to take 24-105L (which turned out to be 3000 cheaper, which was very captivating along with the red stripe :)). I took it at 9 pm, it was already dusk on the street. I didn’t like how 24-105 lathers at dusk and indoors. On the trail. the day went to shoot in sunlight. At aperture 4, the photos turned out soapy on all FRs (as I understood it because of HA). Starting from 5 in perfect lighting - everything is fine. What I really liked about 24-105 is its colors, even in the shadows. In general, I realized that apart from colors and dust and moisture protection, 24-105L from L has nothing. As a result, I changed it the next day to 17-55 with an additional payment of 3 thousand + a used lens hood from 24-105 for 500, and I have no regrets. I compared the detail at aperture 5.6-8 and did not notice the same FR difference at 100% crop (with a fix of 85,1.8, the difference is very noticeable in favor of the fix, of course). Under ideal conditions, 24-105L wins because of the rich colors. But at dusk and in an apartment, 24-105 is almost impossible to use by hand. But 17-55 at dusk and in the apartment makes excellent photos. Also 17-55 is easier. In general, I will not go back to 24-105. There are no ideal lenses, and the 17-55 has more pluses on the crop. 17-55 is an excellent lens, its characteristics are no worse, and possibly better than 24-70L (it does not have a stabilizer), but it costs 1.5 times cheaper. Since I bought a crop, then IMHO you need to use its few advantages over FF, which, of course, include the presence of an EF-S 17-55 lens. If you decide to switch to FF - sell 17-55 without problems, I think. I will advise 24-105L only to people who are going to use it in ideal lighting conditions - its colors are more juicy than those of 17-55 (IMHO of course), and who do not need a wide angle, but need FR 55-105.
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