The Sigma Art 24-105mm f4 DG HSM that you are referring comes in Canon EF, Sony A, Sigma SA, Nikon F mount, and it is a lens that was first released in 2013. It is a DSLR-designed lens. With OEM Canon and Nikon adapters it can be also used on Nikon Z-mount and Canon R-mount cameras, and with Sigma's MC-11 adapter the EF version can be used on Sony E-mount cameras; and with Sigma's MC-21 adapter it can be used on L-mount cameras. .

The Sony 24-105mm f4 G OSS lens was first released in 2017 as a mirrorless-designed E-mount lens. Lens optical design is always progressing, and that four year difference would be measurable in improved image quality, but not necessarily that readily apparent in viewing images side-by-side.

Mirrorless-designed lenses tend to be able to be designed more compact and lighter than comparable DSLR-designed lenses, with better optical designs, shorter flange distances, and often have more modern and faster focus motors. .

Having used both, yes I would say the Sony is better optically, but the Sigma in EF mount was still excellent, and I enjoyed using it.

Sigma does not presently have a mirrorless-designed version of that Sigma 24-105mm f4 Art lens in its lens lineup.

Cheers and best to you.

Here is a shot I made with my ole Sigma 25-105mm f4 in EF-mount with my Sony A7RII and MC-11 lens adapter, years ago in Edinburgh ,Scotland, as a wedding couple was serenaded by a bagpiper.

And that same combo, on same trip, a shot of Tobermory, the capital of the Isle of Mull , Scottish Hebrides Islands, of a double rainbow at low tide.

I sold the Sigma EF-mount 24-105mm f4 when I got the Sony 24-105mm f4 G OSS in E-mount.

Click on download to see better image quality

Cheers

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I also own the Sony 24-105mm f4 G OSS lens, bought it back in 2017, love it too. It is equally as sharp as my Sigma Art 24-70mm f2.8 DG DN lens and with fast, quiet AF also.

Of my current 14 E-mount lenses covering 10mm to 600mm from Sony, Sigma, Tamron, Viltrox, Laowa, this Sony 24-105mm f4 G OSS is my most used lens. It is also Sony's best selling fullframe lens in the world.

Here a shot that was chosen as a Worldwide Photo of the Week by Sony Alpha Photographers in 2021. Environmental Scientist Brooke Hildebrand in a slot canyon, near Upper Antelope Canyon, Navajo Lands , Page, Arizona, USA. Sony A9, Sony 24-105mm f4 G OSS lens, 24mm, ISO 400, f4, 1/30 sec. handheld, all natural light in the canyon.

Click on download to see better image quality.

Cheers and best to you.

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Yes I always understood it was an A-mount version.

Use what works for you and be happy.

Cheers

I have the Sigma Art 24-70mm f2.8 DG DN for Sony E-mount and love it. This Sigma was released in December 2019. I got mine in January 2020. It is Sigma's best selling lens.

The Tamron 28-75mm f2.8 is also excellent, and was released in April 2018, before the Sigma, and gained immediate popularity among hobbyists and pros alike around the world for its image quality, versatility and affordable price.

The version II of that Tamron 28-75mm f2.8 lens is improved, and was released in Oct. 2021 but was delayed a bit due to covid. . And a Nikon Z-mount version was released in 2024.
https://www.tamron-usa.com/product/lenses/g2-performance.html

The Sigma is only surpassed by zooms in this range in image quality (by a bit) by the newer Sony 24-70mm f2.8 GM II, released in April 2022.

For me the Sigma is 90% of the GM II image quality at half the price, so even though I have other GM lenses, I am keeping the superb Sigma.

A new Sigma Art 24-70mm f2.8 DG DN version two is going to be announced in May, to rival the Sony 24-70mm f2.8 GM II. It promises to be even better than the Sigma 24-70mm f2.8 version one.

New Sigma 24-70mm f/2.8 II will be announced in mid May!
https://www.youtube.com/watch?v=mtBy26yIeLg

One of my shots of the Golden Gate Bridge in San Francisco, California, USA. Sony A7RIV camera, Sigma Art 24-70mm f2.8 DG DN lens, 24mm, ISO 200, f8, 1/80 sec., handheld.

Click on download to see better image quality.

Cheers and best to you.

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The Tamron 28-75mm f2.8 in Sony E-mount was the most widely purchased E-mount lens in the world, with excellent sharpness. The version two is even better. Loads of pros as well as hobbyists love it.

Cheers and best to you.

No it is NOT artificial at all. They asked each manufacturer to list what they felt was their most significant and the manufacturers answered.

Simple as that. Not someone else arbitrarily choosing, but the makers themselves choosing, very valid . What problem do you have with that?

Cheers

No

Sadly the "corrected" version V2.01 (which was to fix bugs in V2.0) is the one now revealing hardware issues in some A1 cameras., which I linked above. Open and read the Sony link.

Likely behind this is some motherboard issues which went unnoticed in earlier version 2.0 firmware , but now is uncovered in V2.01, thus revealing this "hardware" issue with some A1. Not all A1 have this issue, but some do.

I will not update to V2.01 at all. My A1 works great and I will leave it alone. My A1 was in the first batch of ones released to the USA, back in Feb. 2021.

Here one of my A1 shots of the recent solar eclipse, shot with my Sony 200-600mm lens at 600mm, in Grapevine Texas, USA, showing the totality with many solar prominences .

Cheers and best to you.

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