I flew on the 773 (77W) 2 cabin...
I actually flew going out on a 763 where it had a 2-3-2 in Economy. If you ever flown on this, the 2-3-2 seating is pretty much the exact same as the premium economy seating on the 773 in terms of leg room etc. Just the touch screen monitor was different.
TBH, I would not pay to upgrade from Economy to Premium as it is not THAT big of a difference..
After seeing those pics, I want to attempt to get onto a 3 cabin business lol, dat single even row config