After quite a bit of fiddling today, I think there's no free lunch to be expected. Many sources come with ringing to begin with and yeah, if you magnify it it will become more obvious...sxbr digs more than NNEDI3 IMHO and as a result also rings more, I currently run sxbr50 with SR(3 passes, 0.65 sharpness, 0.01 softness) and it's working really well IME in mVR .15, OTOH 0.00 softness looks too edgy to my taste.
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