"Making Moves" is part of a small series that focuses on the technological milestones that make Stills to Motion possible.
Shortly following the release of the Nikon D90, Canon followed suit with the Canon 5D Mark II. Introduced as a follow up to the landmark Canon 5D (the first prosumer-oriented "full frame" DSLR) the Mark II presented a milestone of its own, but outside of the stills market.
For many The 5D Mark II filled many of the necessities the D90 missed. Full HD (1920x1080 as opposed to 1080x720), a wide variety of frame rates to support not only cinematic looks but broadcast standards (29.97/30 in North America). But most importantly, showed the amazing image quality that could be pulled from a sub-$10k camera...
Consider the list of projects the 5D Mark II was utilized either as a whole or in part:
Saturday Night Live (Season 35), Opening Sequence
Hawaii Five-0 (CBS), in-parts (warning autoplay video link)
House (FOX), "Help Me" (Season 6 finale), entire episode
Florizel Street (BBC, small unit production)
Speaking of House, Director Greg Yaitanes made some brief details available via twitter, noting the use of off-the-shelf still lenses, as well as its advantage-vs-size (see original source link).
However, what it hands out in image quality, the 5D Mark II set the bar for challenges with a DSLR based production... Audio capture/monitoring, video monitoring, and image control for just a few, but in response the industry of support, accessories, and post production has used these initial challenges to respond with products to address the needs.
From a very broad perspective, the "5D2" (for short), set not only what would be regarded as the standard for a prosumer-market in terms of quality, but features also, reaching a level of notoriety untouched by many yet.