IMO 35J/K are the pick....DEF are great for leg room, but I noted some passengers tripping over the extended legs of seated passengers in DEF whilst walking to the lav.
Great rare pics of the new Y upper deck cabin!
The leg room in row 35 looks great (even DEF). I'm traveling in 35F in a little over two weeks (35J/K are blocked) and I share the same fear of being tripped over by other pax walking by. However my theory is that PE pax wouldn't be using the single Y toilet, and so given it's such a small Y cabin, this hopefully won't be too much of a problem with what looks like great leg room in your pictures.