Yes, Peacock's streaming pictures quality on my Xfinty is way much better than OTA KOB-DT.
KOB-DT, has too many subchannels and hurting the main NBC HD at times get bitstarved, so I usually go over to streaming mode for the NFL game.:p
BTw, Hubbard which owns KOB-DT refused go to ATSC 3.0...