Regarding new 200/2 lenses

So, Sigma brought out a $3600 brand new 200mm ƒ2 lenses with all the whistles and bells - and apparently also stellar optical performance and of course with integrated image stabilization. (This lens is not for Canon cameras, though)

Don't compare the sizes, because they are not exactly aligned to one another

Then there is the Laowa

which for $1999 also brings out a 200 mm ƒ 2 lens, (the Canon EF [AF] version with is only a "mere" $1799 (!!). That way you can actually get AF on an Canon RF camera (via an EF-RF adapter). a

Performance wise i have read that the performance at wide open aperture wasn't quite as stellar compared to other 200/2 lenses. The Laowa is supposed to show some glow and slight fuzziness.

NOTE: [Which does not mean that it is true or gives you the whole scoop. It is just what i have heard/read - and no true real tests are out yet. So, the jury is still out there. Once the new 200mm lenses are being tested, we know more for sure)

Just in case, if there is an "if"

So, if the lesser wide open performance is or would be true - it would mean you have to stop down in order to get better sharpness / eliminating a glowy appearance. But then you don't buy a 200mm ƒ2 aperture lens, when you need to stop it down in order to achieve excellent sharpness / performance ?

It would forfeit the purpose of buying / using such a big lens. (A Canon EF 200/2.8 L also would do the trick, for least amount of money, given how cheap the lens is second hand, and how good it is in optical performance) Or any top-notch 70-200/2.8 zoom !

Sigma nailed it (mostly)

It seems that the Sigma is the stellar one of the new two. Even bypassing (in sharpness) the refined Canon EF 200/2 L IS lens from year 2007/08. Albeit it should be noted that the old Canon doesn't have any secondary optical errors, no glow, no fringing, and no strange aperture bokeh looks, near or far.

The Canon was $6000 in price when it came out. In Sweden it was 55.000 SEK back in 2008, while i bought it from Germany for 45.000 SEK paying it off over the course of 6-7 years. That would be like buying a 75.000 / $ 7000 today.

Yet, the new Sigma is "only" 40.000 SEK / 3600 € in year 2025 today. So, that is an astonishing attractive price, compared to what the Canon or Nikon equivalent once cost.