When Sony announced the WH-1000XM4C headphones, I was perplexed. A product revamp usually includes at least one or two significant improvements. Or if it’s a nostalgia play, it’s from a decades-old product and not one that came out in 2020. Beyond a few minor tweaks, though, the XM4C are remarkably similar to their six-year-old namesake, the beloved WH-1000XM4. They even use the same processor for active noise cancellation (ANC).