Compared to other manufacturers (Bombardier, Embraer) that tend to make regional jets which max out at 2x2 seating, this is a large jet for a non-Airbus/Boeing(/Tupolev) manufacturer.

Only the longest stretched fuselages on the newest 737/A320s can carry more than 200 passengers, and there are a lot of 737-800s still flying that carry 160 or so people. China could very well build a stretched fuselage C919 if the project ends up being a success.