I bought both during the corona lock down here in Germany to support my local dealer. The original plan was to buy them in August but now they could use it more, I guess.
The lens is much heavier than the Sigma 150-600C but the quality is something else. And the focusing! Oh my god the focusing. Even with the 1.4 teleconverter! It is amazing and works so well on the a7III.
The following shots are all made around 840mm, handheld with a very bright sun during noon time.
I bought this lens today and tested it during our shopping trip in the city. The camera was my Sony a7III. As you can see in the photos, 14mm can be really extreme and most of these shots could use some heavy dimension correction. I only cropped, rotated and changed some colors here and there. This means, I didn`t fix any dimensions or distortions. Also, most shots were made during walking. No tripod usage today (which is a must, if you want to take some seriouse photos with a lens like this).
The clear advantages are architecture, landscape and anything in tight rooms. You can get really close with the lens but it looks too wild in any kind of macro photo.
Yes, it works when you use a Canon FD to Sony E adapter which can be bought for a few bucks on Amazon. The lens is a manual focus lens and the adapter will not change that. Since you are about to make some macro photos, you should learn to use the manual mode anyway. It’s the way to get the best results. The Sony supports you with a magnification function which is awesome for any manual and macro lens.
There is a downside to this. You will face some rather special bokeh. I hope you like hexagons. If not, you can still get the Sony 90mm macro for 7 times the price. Have a look for yourself.