On the same boat here. Checked some reviews online, the two are at the same ballpark....
【在 A********o 的大作中提到】 : 刚买了Tamron的 两个比起来怎么样
s*3
7 楼
sigma的这个比较新一点
n*y
8 楼
deal dead
A*o
9 楼
两个都买了 到时候退掉Tamron的
A*o
10 楼
这有和大白兔比较的 Another comparison that some will consider relevant is the Sigma 150-600 Contemporary compared to the Canon 100-400mm L IS II Lens. The Canon is lacking a significant 200mm on the long end, but this lens is Canon's longest small-form-factor zoom and it is a very impressive performer. The Canon bests the Sigma in sharpness and contrast over the entire shared native focal length range. Add a 1.4x to get the Canon up to 560mm the Canon is still at least as sharp, though the extended Canon lens has a narrower max aperture at 560mm (f/8.0 vs. f/6.3). The Canon has wider native apertures than the Sigma. The Canon has a significantly higher MM (0.31x vs. 0.20x), is smaller in size and is modestly lighter in weight. The Canon is significantly more expensive and focuses more accurately.