My tests of the sharpen setting on the A1 seem to indicate the following

-9 is no sharpening
0 is medium sharpening
+9 is strong sharpening

I was wondering if this is consistent with other people's findings.

Thanks,
Anna

That's about right. For "film" projects (quotations because really it's still video), I use the -9 setting, for video projects I generally have it at 4.