I was reading 5 days ago about the quantum scape battery but it is all in comparison with regular lithium ion batteries - Quantum is solid state not liquid, charges faster (15 mins for a 80% charge for auto sixed unit, uses less space and better density. so will be lighter than lithium ion
extrapolating to FC comparison it is a more serious contended where FC is currently king - last mile and long range trucking for instance It may provide competition for the Material handling not sure about performance in high and cold temperatures/humidity yet