The WH-1000XM5 had a problem: it was excellent, but it wasn't a big enough jump over the XM4 to feel urgent, and it dropped the folding hinge people liked. The WH-1000XM6 fixes both complaints at once. The hinge is back, the case is smaller, and the new QN3 processor — Sony says it's seven times faster than the old QN1 — retunes noise cancellation in real time instead of applying one fixed profile.
None of that would matter if the fundamentals had slipped, so that's where we started. Battery life, call quality with the four extra microphones, and comfort over long sessions all got the same fixed-rubric treatment we give every headphone we test, run back to back against the outgoing model and three of its closest rivals.