here goes mine:
djokovic’s forehand (watch the 07 us open final and its not hard to notice how massive of a change it was)
wawrinka’s forehand (no need to comment here)
nadal’s forehand
federer’s backhand '17-'18 (that one is questionable, maybe its more due to the larger racquet frame)
not to lowball or feel superior or anything else, but just to add to this discussion i would like to add the facr that djokovic has never played wilson racquets, they were all paintjobs