The-Digital-Picture has completed their review of the brand new and aggressively priced Sigma 100-400mm f/5-6.3 DG OS HSM C lens.
From TDP:
The AF accuracy could be slightly improved and a tripod ring would be nice to at least optionally have available, but otherwise, the 100-400 C gives you a very useful range of focal lengths in a relatively small and light, nicely-designed, full-featured package. This is a lens that you will want to take with you and that alone means you will capture more images. The great image quality for a very reasonable price seals the deal on this one. The Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary is another lens warranting kit-addition consideration. Read the full review
Sigma 100-400mm f/5-6.3 OS Contemporary $799: B&H Photo | Amazon | MPEX