V.4 just kills too much FINE detail. Yeah, it sharpens medium to low frequency detail, but just kills all the fine stuff. It also has too much artifacting on quickly moving objects.
Might want to wait until I have my de-ringing script ready. It's looking good so far, just want to be sure before I make a fool of myself (yet again)
But, that'll look more like V.6 anyway. If you want to fix V.4, just replace the entire "global motion" stage with the new one.
-G