Cinebloom filters are quite a string effect, there is a series of Tiffen filters - Black ProMist which is available in different strengths 1/8, 1/4, 1/2 the 1/2 is probably equivalent to the Cinebloom 10%.
The Black Promists, retain the Blacks and the contrast better than a regular difussion filter. I've used the 1/4 quite a bit and as
@LeeRatters says they tend to soften the image slightly (IMO without loosing all teh sharpness), tends to make a digital image look less digital - if that makes sense. Highlights are hallinated giving them a more film like glow. I've been thinking of getting a 1/8 and seeing if that just takes the edge opff, as the 1/4 can be a bit strong esp[ecially if there are artifical lights about.
(and before you ask me to don a labcoat

no, I don't have any with/withoiut shots of the same subject.)