I'm kind of delighted that the author of that article, Michael Abrash, worked at Microsoft (twice), at Valve, and is now at Oculus.

Most of the journalists w/ first person demos have given relatively poor descriptions, but Oliver Kreylos a UC Davis VR researcher recently published a very in-depth review of his experience w/ the Hololens hardware, including his observations on FOV, occlusion, etc: http://doc-ok.org/?p=1223