I also much prefer the 744 in J class to the 380. It's not just the barn-like sensation of the cabin but the amount of time it takes for service towards the back (90 mins for a drink in 24K) - and also, especially, the impossible configuration of the toilets and galleys. I am sure there is an algorithm to calculate the difference in availability but just a glance will show that lines for the toilets are much longer than in the 744 even if the basic ratio is similar. SQ's arrangement is better and the aisle access for every seat makes a big difference.