Sigma has done more for enthusiast APS-C than Nikon, Canon and Sony combined

There's no reason APS-C can't be a good enthusiast format, with the right lenses. Full-frame is being touted as the future of enthusiast as well as professional photography. But I’d argue that APS-C is still a highly capable format and one that makes sense for a lot of people. That could be true for an even broader group if it was properly supported as an enthusiast format. And, I’d contest, one company has consistently done more to support the big brand's users than the camera makers...