Having flown 3-4-3 economy on 777s numerous times (albeit on QR, same Recaro CL3710 nonetheless), I can say the following:
It is not as bad as people make it out to be! The slimmer seats means bigger perceived legroom, which to most people (at least me) is more noticeable.
I weight train and work out, so have broader shoulders. 50% of my flights are full, even though I sit in the aisle seat, I don't feel I'm any closer to my neighbours as opposed to a 3-3-3 config 777. What I do is, I get a G&T before meal, 2 glasses of wine with meal, cognac + baileys after, that will knock me right out.
Little tip: the bottom portion of the headrest is an adjustable neck support. Pull on it and it will fold up. I find the CL3710 headrest the best amongst all the YCL seats I've flown and I've had the best sleep in them. Padding may 'look' thin but it's where it's needed.