350 vs 777X? Unfortunately Boeing finally threw in the towel with airbus's marketing BS and now they both engage in the same mud slinging.
Airbus claims theirs is better by X amount. But Airbus is assuming 9 across seating on the 777. Over 80% of 777's are being ordered and delivered with 10 across seating. Boeing's numbers use the 10 across cost per seat mile number.
I have had the displeasure to ride in a 10 row 777 a couple of times and it sucks. But who cares. I bought the cheapest tickets just like the other wankers riding in the cheap seats with me.