Like the $30 Fujian/Fotasy 35mm, the Helios 44-2 58mm f2 is a lens famed for soft, flat, dreamlike results, appealing to modern video shooters searching for that vaunted "filmed on 16mm in 1974 by druids" look.
And, unlike the $30 Fujian/Fotasy, it isn't completely terrible. Stopped down, it's much sharper and undistorted. I found it difficult to focus, though, and it has a ~150mm equivalent field of view on my Blackmagic Cinema Camera, so it's not very versatile. The internet given wisdom is that the coatings changed frequently on this Soviet-era Zeiss clone over the years of its manufacture, meaning that flare and color characteristics vary widely.
The 44-2 was made in vast numbers, meaning you can find them on eBay for reasonable prices. You'll need an M42-mount adapter, for your modern camera, to go with it.
My footage was shot in RAW and ungraded, except for a few clips that were overexposed, where I applied luminance curves. Normally, one would enhance the colors in post-production.
Download a 13MB zip of some RAW frames. JPGs (photoshop, 80 quality) are below.
This fellow has a much more formal and extensive set of tests, shot with the Blackmagic Pocket (which crops the image 3x from full-frame, compared to the 2.4x of my Blackmagic Cinema Camera) and paying more attention to the details:
UPDATE: Here's some footage I shot with a less expensive camera, the tiny Panasonic GM1.