Does a wired streamer sound a LOT better than a wireless connection?

Great question :
(If i may piggyback)

All else being equal:
 does a record sound better than a cd
  does a cd sound better than a streamer
   Does a wired streamer sound better than a wireless streamer

-all else being equal-
-better is not subjective here-

I found that bog-standard cat 6 wire sounded better than wireless (large orchestras, etc), but that could be a tech (rather than configuration) matter.
As regards the additional questions:

All else being equal:
1)  does a record sound better than a cd
  2) does a cd sound better than a streamer
   3) Does a wired streamer sound better than a wireless streamer

In my experience:1) Yes undoubtedly, or the TT set-up is poor2) Depends, usually yes, but a top-notch streamer playing hi-res files (i.e. Qobuz, Tidal, etc) will sound better.
3) In my case, yesRegards

Yes