Laughing my ass off, I have shot with RED/BMCC/BMPCC, A7s definitely have more DR than BM's 13 stop , I have encountered some scene (pretty extreme condition) which BM get blown but still fine on A7s. I originally thought Sony probably have usable 12stops dr after reading "online test" but after seeing the actual footage me and DOP agreed A7s do have more DR than BM.