I have several different targets, and the only one worth a crap is the Hutchcolor. I also have a Kodak Ektachrome IT8 and an individually measured Fuji brand IT8 as well. The Hutch target is a better target, patch wise and is hand measured with the corresponding data file. I use the Hutch target for everything I scan on my drum scanner except black and white. You can generally use the Velvia target for all E-6 films, as they respond very closely to each other on most scanners. K-14 is another story altogether, but very doable with a few tweaks. The reason for using the Velvia target is that Velvia has the largest color gamut of any E-6 film and everything else will fall inside of that, remembering whatever you use for the input profile on the scanner will define the gamut of the scans even if the scanner itself can "see" more color on it's own. A good scanner profile is designed to get you very close to what's on your original film, but don't let that stop you from making your scans better than that. I have yet to find an image that can't be made better in post.