This is an excellent all around lens and one of the most popular as a general "walk-around" lens. As an L series, the quality is excellent and it is quite sharp. I have this lens, and on a FF body, it's extremely versatile - from wide to short tele, and the IS is very effective. probably on my camera as much as all my other lenses combined. Here are the downsides: first, on a crop body, the widest setting is not especially wide (but you have that covered with the Sigma). Second, there is a known ribbon cable issue as the lens ages on some copies, and the repair is $200-300. Third, even though the cost is coming down because the MKII version is now available, the price you're quoting for a new, not used, copy is too low, which tends to indicate it's a grey market lens. That may or may not matter to you, but it essentially means that Canon USA will not honor the warranty. You may be able to get warranty work if you mail it to its country of origin. If you want to be sure, ask for the S/N prior to purchase and check it with Canon support. In short, great lens, especially since you have wider focal lengths covered, but the price is suspiciously low since used copies of this lens are selling for $500-600.

I have that lens. The price you mentioned means it is most likely GREY MARKET. Google Grey Market to better understand the value.

If budget is a restraint look to Refurbished from Canon Direct or the ABC.

https://shop.usa.canon.com/shop/en/catalog/ef-24-105mm-f-4l-is-usm-refurbished

Current price 799 USD but on promotions as low as 5-6 Hundred.

On a APS-C lens I prefer a wider zoom, but that is just me. While I have the 24-105 for my 6D, I have a 15-85 and 18-135 EFs.

J. R.

You have the right idea, top trainer. But, you're using a short lens in the making, you have to correct this. The photos show more of the body and a smaller head.
Your eye goes to the body first then the head. The're not balanced. This happens when you move in close with a short lens.

On your next shoot try using a longer lens. Make more photos with a 100mm, 150mm, evan a 200mm. Stand back further and do focus on the eyes. Shoot wide open or go to f5.6 no more! Use one frontal soft-box not two. Study striking portraits by KARSH. Theirs no end to the creative mind! AP