I am on this flight in C in two weeks. I'll report back if nobody reports by then.
I suspect, the service will be 100% identical. The only difference is the seat.
Also, the 3-class on this route is temporary and it will be replaced with one of the reconfigured ghetto birds by the end of the month.
Have you noticed it only EWR-SFO or the other direction as well? Do you recall the flight #? I would happily rearrange my schedule when I fly SFO-EWR-SFO for this.
I am showing the international configuration flying on the following flights:
UA465 SFO-EWR
Dep: 7:40am Arr: 4:16pm
UA550 EWR-SFO
Dep: 2:30pm Arr: 5:51pm