Leeham's editorial is almost 3 years old,
here
Meanwhile, Cseries beat the brochure. Of course, in service cost is not only about fuel consumption. Cseries is only better, as example airfield performance, the freedom of departing from a regional airport or city center. Hence, small airport charges, short boarding and taxi, number one for takeoff or landing, then more trips per day, also smaller fees for CO2 emissions and noise. In addition best passenger experience, the generous interior, CSeries 3.28m vs E195-E2 2.74m, large windows and large over-bins, largest lavatory, the slickness of flight, the time-saving and delightful trip.
https://youtu.be/GpjoVdRSj14