Which Sony over-ears are actually king for 10+ hour flights right now? Ive been a loyal XM3 user for years and honestly the ANC was unbeatable back in the day but the hinge finally snapped on me last week while I was packing for a trip to Tokyo. I know the XM4 and XM5 are the current big players but I keep hearing conflicting stuff about the foldability versus the driver quality. Ive got about $400 to drop before I leave next Tuesday and I really need something that wont make my ears sweat after hour six. Is the XM5 worth the extra bulk in my carry-on or should I just hunt down a deal on the older ones?