fieldskit shouldn’t degrade anything that doesn’t move. if it does, it loses a little bit of quality.
if you do have the original hand drawn stuff that’s not interlaced, you won’t even need to worry about deinterlacing because the export will be progressive.
if your graphics aren’t moving much at all, they will not lose any quality at all, even if its pre-rendered.
the live action will still have to be deinterlaced.
You should think of fieldskit as a passthrough for motion sensitive interlacing.
I do have a list of other deinterlacers if you’re interested in the comparison of quality.
https://forums.creativecow.net/thread/2/1070267#1070295