The new Sigma is put through it's paces and compared with the Canon 100-400mm L lens by Dustin Abbott........................
.......it turns out to be sharper at all focal lengths even at 400mm !!!
...also it has better contrast than the Canon.
The Canon beats it on vignetting though, the Sigma starts at F5 whereas the Canon starts at F4.5.
The Sigma is under $800 verses over $2,000 for the Canon.
Shock horror: The Canon has focus breathing which the Sigma hasn't!.........
OEMs are going to struggle selling their lenses in the oncoming years with the competition from TPMs, especially since the recent OEM releases seem to have doubled in price, perhaps they are seeing how far they can push it before people "bulk" and go for the Siggies and Tammies!
BTW. It got a very praiseworthy review from Lenstip too!