It's going to frequently rely upon the airline, route, and aircraft style. Some airlines may give a hybrid class among business and first, while some might have a bigger hole in between The 2 classes. American Airways' A321neo dark-gray leather first-class recliners are smooth and streamlined, and look even sharper https://businessflightshop.co.uk/blog/fly-like-a-royal-by-availing-more-discount-business-class-flights/