Sony’s WH-1000XM4 noise-cancelling headphones promise comfort, clever features and superb sound quality. Do they deliver?

The WH-1000XM5 don't replace the vaunted WH-1000X4 -- they are an upgrade. Here's what's new, what's the same, and which you should buy.

Sony WH-1000XM6 vs XM4: design Again, five years is a long time in terms of headphone lifespan, so it isn't surprising there are differences between the XM4 and XM6 in terms of design.