Canon 24 -70mm F4 IS USM vs Tamron 24-70mm F2.8 VC

Hey guys, here is a new comparison video where I compare the Canon 24 -70mm F4 IS USM vs Tamron 24-70mm F2.8 VC. I need a standard zoom lens for my Canon 6D and ordered a few and I did this comparison. I end up with a Sigma 24-105 f4 OS, because it is as sharp as the Canon 24-70 F4 and it offers more zoom range. The Tamron is less sharp then the other two on fine details and in the corners its less sharp. Hope you guys enjoy! All photos taken with my Canon 6D in raw-format. The reframing was done in Photoshop CS6 and the video was cut with Sony Vegas Pro 13.