msycamore said:

What bothers me in that scene are the extreme amount of haloing/edge enhancement and video dropouts.

With the source already this badly halo'ed, you must de-halo, especially before applying any sharpening, to get decent results. To demonstrate:

I max'ed the settings on "DeHalo_alpha" (rx=3.0, ry=3.0, lowsens=0, highsens=0), a script I copied somewhere -- DeHalo_alpha(clip clp, float "rx", float "ry", float "darkstr", float "brightstr", float "lowsens", float "highsens", float "ss") -- but couldn't make all the halo-ing all disappear. Maybe there's a better version? It softens the picture a little but following up with "LimitedSharpen" (made it pretty strong here, too -- strength=600, soft=true, overshoot=0, exborder=4) nicely brings the crispness back ... for a better overall result. (Of course, you would tweak the settings for better balance than I did for this proof-of-concept.)