Sony's new WH-1000XM4C wireless headphones, priced at £219/$300, create a market dilemma by positioning themselves near the XM5 model, which will be discontinued in February 2024 due to EU battery regulations. The XM4C features the classic folding design and retuned sound via DSP, while the newer XM5 has a smaller driver but reportedly sounds clearer, leaving consumers uncertain about which model to choose.